Sign In Get Started
Preposition after verb

When to use “lock in” and “lock into”

Lock in is common for securing, fixing, or committing something. Lock into is used when something moves or connects into a position or system.

Quick answer

Lock in vs. lock into

Use lock in when you mean secure, confirm, or fix something such as a price, plan, or agreement. Use lock into when something physically or technically connects into place or becomes integrated with a system.

We decided to lock in the lower interest rate.
The battery locked into the charging dock.
Investors want to lock in their profits before the market changes.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
lock in + price/result

Securing or fixing something

Lock in often means to secure a condition, rate, agreement, or advantage so it will not change.

They managed to lock in a three-year contract.
You can lock in today's exchange rate.
2
lock in + person/team

Committing someone to a plan or schedule

Lock in can mean to confirm participation or make an arrangement definite.

We need to lock in the speakers for the conference.
3
lock into + position/system

Connecting or fitting into place

Lock into describes physical or technical attachment, alignment, or engagement.

The wheels locked into the track automatically.
The software locks into the company database.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
lock in
They locked in a fixed mortgage rate.
secure or guarantee something
lock into
The device locks into the base station.
connect or fit into place
lock in with
The meeting locked in with our travel plans.
not a standard fixed construction; with introduces a separate relationship
lock into doing
He felt locked into working weekends.
be trapped or committed to a situation

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using lock into for prices or agreements

For securing rates, deals, or plans, lock in is the usual form.

✕ We locked into a lower price. ✓ We locked in a lower price.

Confusing physical attachment with commitment

Use lock into when something fits or connects into place.

✕ The cable locked in the socket. ✓ The cable locked into the socket.

Adding an unnecessary preposition

Lock in already functions as a complete phrasal verb in many contexts.

✕ They locked in on the contract. ✓ They locked in the contract.

Quick practice

Choose the expression that matches the intended meaning.

1. We should ___ the current rate before prices rise.
2. The seat clicks when it ___ the rail.
3. The company wants to ___ long-term supply contracts.

Check your sentence in context

Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.

Free to try · No signup required

Frequently asked questions

Can lock into mean commit to something?

Yes. It can describe becoming tied to a system or situation, especially in business or technology contexts.

Is lock into common in finance?

Lock in is much more common for rates, profits, and contracts.

Can I say lock in to?

Sometimes to begins a separate infinitive, as in lock in to save money. That is different from the phrasal verb lock into.

label, as, label, with lag behind, in, from, on or by? "land on" or "land in"? languish in, at, on, for or near? last for, from, until, in or through? "latch onto" or "latch on"? laugh at, with, about, in or for? launch in, by, on, at or into? "lay on" or "lay in"? lead to, by, up, in or from? "leak to" or "leak from"? lean on, towards, against, toward or to?

Write with confidence in Linguix

Create a free account to check complete texts, apply suggestions, and save your documents.

Create a free account