other wise (otherwise)

If you mean "in a different way" or "if not," write otherwise as one word. Writing other wise (two words) is almost always a spacing error that weakens clarity.

Below: the quick rule, punctuation notes, realistic examples for work, school, and casual contexts, six wrong/right fixes, three ready rewrites, a simple memory trick, and related pitfalls to watch for.

Quick answer

Use otherwise (one word) when you mean "in a different way" or "if not." Avoid the split form other wise or other-wise for that meaning.

If you can replace the phrase with "if not" and the sentence still works, use otherwise.
Punctuation (semicolon, comma, period) changes tone but not the single-word form.
Other-wise and other wise are nearly always errors unless someone is deliberately playing with language.

Core explanation: why otherwise is one word

Otherwise is an adverb: a single unit that means "in a different way" or "if not." The suffix -wise has fused with other to create this standard adverb; separating them breaks the word and its function.

When you see other wise in text, the writer usually meant otherwise. Fixing the spacing restores meaning and flow.

Correct: Close the window; otherwise, the room will be cold.
Incorrect: Close the window; other wise, the room will be cold.

Spacing and hyphenation: when -wise stays attached

-wise normally attaches directly to a word (clockwise, lengthwise, otherwise). You don't insert a space and rarely need a hyphen.

Hyphens with -wise appear only in rare coinages or to prevent awkward letter runs; otherwise is not one of those cases.

Best: otherwise (one word).
Avoid: other wise, other-wise.
If you find other-wise in a source, treat it as an error or a deliberate stylistic choice-rare and nonstandard.

Wrong/right example: Wrong: other-wise we would have missed it.
Right: otherwise we would have missed it.

Grammar: punctuation and natural placements

Common patterns: "X; otherwise, Y." (tight, formal) "X. Otherwise, Y." (separate sentence) "X, otherwise Y" or an em dash for casual tone. Choose punctuation for rhythm and emphasis; the adverb remains otherwise.

Formal: Use a semicolon: "X; otherwise, Y."
Neutral: Make it a new sentence: "X. Otherwise, Y."
Casual: Use a comma or dash sparingly: "X, otherwise Y" or "X - otherwise, Y."

Usage: We must leave now; otherwise, we won't arrive before dark.

Real usage: practical examples for work, school, and casual writing

Otherwise works across registers. Punctuation and rhythm change with formality, not the single-word spelling.

Work (formal report): Submit the revised draft by Monday; otherwise, stakeholders can't review it on time.
Work (email): Please confirm numbers by EOD, otherwise we'll proceed with the estimates we have.
Work (chat): Approve the asset now - otherwise I'll upload the previous version.
School (essay): Provide evidence for that claim; otherwise, the conclusion is unconvincing.
School (feedback): Repeat the experiment; otherwise your results are not reproducible.
School (reminder): File your application by Friday, otherwise you won't be considered for the scholarship.
Casual (text): Bring a sweater, otherwise you'll be freezing at the beach tonight.
Casual (social): Hurry up, otherwise we'll miss the movie start.
Casual (post): Don't forget to charge your phone - otherwise you won't get my call.

Try your own sentence

Test the whole sentence rather than the isolated phrase. Replace "other wise" with "if not": if the sentence still works, change to otherwise and adjust punctuation.

Examples and corrections - 6 common wrong/right pairs

Each wrong sentence shows the typical two-word split; the corrected sentence uses otherwise (one word).

Work - Pair 1: Wrong: Please submit the report by Friday; other wise, we will miss the deadline.
Right: Please submit the report by Friday; otherwise, we will miss the deadline.
Work - Pair 2: Wrong: We can proceed, other wise notify me if anything changes.
Right: We can proceed; otherwise, notify me if anything changes.
School - Pair 3: Wrong: Study the chapter; other wise you'll struggle on the exam.
Right: Study the chapter; otherwise you'll struggle on the exam.
School - Pair 4: Wrong: If you don't cite your sources, other wise your grade will suffer.
Right: If you don't cite your sources, otherwise your grade will suffer.
Casual - Pair 5: Wrong: Hurry up-other wise we'll be late to the movie.
Right: Hurry up - otherwise we'll be late to the movie.
Casual - Pair 6: Wrong: I meant to reply earlier; other wise I would have RSVPed.
Right: I meant to reply earlier; otherwise I would have RSVPed.

How to fix your sentence - step-by-step rewrites

Quick method: (1) Replace "other wise" with "if not" to check meaning. (2) If it fits, change to otherwise. (3) Pick punctuation for tone.

Swap test: other wise → if not → if it works, use otherwise.
Use a semicolon before otherwise for formal linkage: "X; otherwise, Y."
Choose a period or em dash for a stronger break in casual writing.

Rewrite 1: Original: Please check the figures other wise investors will be confused.
Rewrite: Please check the figures; otherwise, investors will be confused.
Rewrite 2: Original: She didn't follow the instructions other wise the sample would be valid.
Rewrite: She didn't follow the instructions. Otherwise, the sample would be valid.
Rewrite 3: Original: Pack a charger other wise my phone will die.
Rewrite: Pack a charger, otherwise my phone will die.

Memory trick and quick checks

Mnemonic: If you can say "if not" naturally, use otherwise (one word). That swap catches most errors.

Practical checks: search your document for the two-word string "other wise." Apply the swap test, fix the spacing, and adjust punctuation. Add this to your proofreading checklist.

Swap: other wise → "if not"? Yes → change to otherwise.
Search your file for "other wise" to catch accidental splits.
Track other frequent two-word mistakes you make (any way vs. anyway, every day vs. everyday).

Search example: Find "other wise" → try "if not" → replace with "otherwise" if it matches.

Similar mistakes to watch for

Other adverbial and suffix issues follow the same logic: decide whether a single word or two words is correct, and test with a replacement when possible.

anyway (one word) vs. any way (two words) - "Anyway, let's begin." vs "in any way."
everyday (adjective) vs. every day (time phrase) - "an everyday shirt" vs "I exercise every day."
clockwise, lengthwise, likewise - these -wise forms are single words like otherwise.
"wise" as an adjective (meaning sensible) stays separate: "a wise decision." You can't make "other wise" mean "other sensible."

Usage note: Wrong: She made an other wise choice.
Right: She made another wise choice OR She made a wise choice.

FAQ

Is it "other wise" or "otherwise"?

Write otherwise (one word) for "in a different way" or "if not." The split form other wise is incorrect in that sense.

Can I hyphenate "other-wise"?

No. Avoid hyphenating otherwise in normal writing. Hyphens with -wise are reserved for rare coinages or clarity fixes.

How should I punctuate sentences with otherwise?

Use "X; otherwise, Y." for a close, formal link. Use "X. Otherwise, Y." to separate sentences. For casual tone, a comma or dash works: "X, otherwise Y" or "X - otherwise, Y."

When would "other wise" ever be correct?

Only when the context literally pairs the words "other" and "wise" as separate ideas (for example, playful or poetic phrasing about different kinds of wisdom). For the sense "if not" or "in another case," use otherwise.

How can I stop making this mistake?

Search for "other wise" during edits, apply the "if not" swap test, and add that check to your proofreading routine or use a grammar tool that flags spacing errors.

Want a one-click fix for "other wise" in your draft?

Search your document for "other wise," try the swap test, and replace with otherwise when appropriate. Most editors and grammar tools will flag this spacing error and offer the correct form and punctuation suggestions for long drafts.