a know (known) bug/problem

Writers sometimes type or say "a know" when they mean "a known." The missing -n turns the past participle/adjective into a verb base form that doesn't fit before a noun, and the sentence sounds ungrammatical.

Read the quick rule, the grammar behind it, many real rewrites, and simple checks you can use immediately in work reports, school papers, and casual messages.

Quick answer

"a know" is incorrect. Use "a known" (or rewrite the sentence) because "known" is the past participle of "know" and functions as an adjective in phrases like "a known issue."

• "a known issue" = correct (known describes the issue).
• "a know issue" = incorrect (know is a verb base form and doesn't modify the noun).
• If unsure, rewrite: "an issue that is known" or "a reported issue."

What's actually wrong: the grammar behind the error

"Know" is a base verb (I know, you know). To describe something already recognized, use the past participle "known," which acts like an adjective: "a known bug," "a known fact."

Putting "know" directly before a noun leaves the noun without a proper modifier. Native speakers expect an adjective or an adjectival phrase in that position; "known" fills that role.

• "know" = verb.
• "known" = past participle used adjectivally.
• Typical pattern: a/an + known + noun (a known problem, a known limitation).

How "known" functions: adjective, past participle, placement

"Known" commonly modifies a noun directly ("a known problem") but also appears after linking verbs ("The issue is known") or in passive constructions ("The bug is known to cause crashes").

• Before a noun: a known problem (adjective).
• After a linking verb: The issue is known to the team (predicate adjective).
• Passive use: The bug is known and being investigated.

Examples you can copy (work, school, casual)

Each wrong sentence shows the "a know" error; the matching right sentence gives the correct phrasing. Use these as templates and adapt details (product name, class, person).

• Work - Wrong: There is a know issue with the server causing timeouts.Work -
  Right: There is a known issue with the server causing timeouts.
• Work - Wrong: We logged a know bug in the CRM last night.Work -
  Right: We logged a known bug in the CRM last night.
• Work - Wrong: Please escalate any know security vulnerabilities immediately.Work -
  Right: Please escalate any known security vulnerabilities immediately.
• School - Wrong: This is a know limitation of the experiment that affects validity.School -
  Right: This is a known limitation of the experiment that affects validity.
• School - Wrong: Prof. Rivera pointed out a know error in the dataset.School -
  Right: Prof. Rivera pointed out a known error in the dataset.
• School - Wrong: There is a know discrepancy between the two measurement methods.School -
  Right: There is a known discrepancy between the two measurement methods.
• Casual - Wrong: That's a know problem with the app; it crashes on launch.Casual -
  Right: That's a known problem with the app; it crashes on launch.
• Casual - Wrong: He's got a know allergy to shellfish so don't add shrimp.Casual -
  Right: He's got a known allergy to shellfish, so don't add shrimp.
• Casual - Wrong: I have a know headache after the concert.Casual -
  Right: I have a known headache after the concert.

Fix your sentence: a step-by-step repair checklist

When you spot "a know," pause and ask: is this word supposed to describe the noun? If yes, change it to "known." If the phrase still feels awkward, rewrite the clause instead.

• Step 1: Decide whether you need an adjective before the noun.
• Step 2: If yes, replace "know" with "known."
• Step 3: If the sentence remains clumsy, rewrite: "an issue that is known," "a reported issue," or "the team has identified an issue."

• Rewrite example: Wrong: There is a know timeout that affects users.Quick fix: There is a known timeout that affects users.Rewrite option: Users are affected by a timeout that has already been reported.
• Rewrite example: Wrong: We fixed a know typo in the syllabus.Quick fix: We fixed a known typo in the syllabus.Rewrite option: We corrected a typo that had been reported in the syllabus.
• Rewrite example: Wrong: That's a know glitch on my phone.Quick fix: That's a known glitch on my phone.Rewrite option: My phone has a glitch that other users have reported.

Try your own sentence

Test the whole sentence, not just the phrase. Context usually makes the correct choice clear.

Hyphenation and spacing: when to hyphenate "well-known" and friends

"Known" by itself isn't hyphenated before a noun: "known issue." Compound modifiers that include "known" often use a hyphen when they come before a noun: "well-known issue."

After the noun or a linking verb, drop the hyphen: "The issue is well known." Also avoid merging words or leaving out spaces: never write "a knownissue."

• Before noun: well-known issue (hyphenate), known issue (no hyphen).
• After noun/linking verb: the issue is well known (no hyphen).
• Never write "a know issue" or merge words without spaces.

Real usage and tone: when "known" is blunt and better alternatives

"Known" is neutral and factual-ideal for status reports and bug trackers. For customer-facing messages, soften the tone: use "a reported issue" or "an issue we're investigating."

In academic writing, "a known limitation" is concise. For friendly updates, add context: "We're aware of an issue affecting login and are working on a fix."

• Formal/work: "a known issue" or "a known limitation."
• Customer-facing: "an issue we're investigating" or "a reported issue."
• Casual: "a problem others have seen" or "a thing people have noticed."

Memory tricks to stop typing "a know"

Think "known = noun modifier." If you're about to describe a noun and reach for "know," swap in "known" in your head: "a known bug" becomes automatic.

Make a quick edit habit: search your draft for " a know" and fix manually, or practice saying "a known" aloud to train voice typing.

• Mnemonic: known = known (past participle and adjective).
• Habit: search for " a know" and correct each instance.
• Practice: repeat "a known limitation, a known issue, a known error" aloud to lock the form in.

Similar mistakes to watch for

Mixing verb bases and participles is a common pattern: "a understand" should be "an understood" or rewritten as "an understanding of." Watch hyphenation and contractions, too ("well-known" vs "well known," "its known" vs "it's known").

• "a understand" → correct: "an understood [noun]" or "a limitation we understand."
• "its known" → correct: "it's known" (it is known) or "its known [noun]" depending on meaning.
• "well known" → hyphenate before a noun: "a well-known issue."

FAQ

Can you say "a know bug" in a bug report?

No. Use "a known bug." To soften customer messages, use "a reported bug" or "an issue we're investigating."

Is "known" an adjective or a verb?

"Known" is the past participle of "know" and often functions as an adjective (a known issue). It can also appear after linking verbs in passive constructions (the problem is known).

Should I hyphenate "well-known issue"?

Yes-hyphenate compound modifiers before a noun ("a well-known issue"). After the noun or verb, don't hyphenate: "The issue is well known."

Why does autocorrect sometimes miss "a know"?

Autocorrect may not flag "know" because it's a valid word in other positions. Context-aware grammar checkers catch the error more reliably since the problem depends on function, not spelling.

What's a quick rewrite if I don't want to use "known"?

Try: "an issue that is known," "a reported issue," "the team has identified the problem," or "an issue already documented." These often read better for customers.

Quick check: catch "a know" before you send

Scan your draft for " a know" or run a context-aware grammar checker. Fixing this small error improves clarity and professionalism.

Practice the replacements above and make a habit of searching drafts before you send. A short pass focused on participles saves misunderstandings.