I UK [lɒk] / US [lɑk] verb
Word forms "lock":
present tense I/you/we/they lock he/she/it locks present participle locking past tense locked past participle locked
a) [transitive] to fasten something such as a door or a container, usually with a key, so that other people cannot open it

John went out and locked the door behind him.

Have you locked the car?

lock something in something:

She locked the documents in the safe.

b) [intransitive] to become fastened with a lock

The door slammed and locked.

This drawer won't lock.

a) [intransitive] if something locks in a particular position, it is firmly fixed or held in that position

The brakes locked and the car spun off the road.

b) [transitive] to lock or fix something firmly in a particular position

He locked his arms around her waist.

3) [transitive] computing to prevent information on a computer from being changed or looked at by someone who does not have permission

All entries are locked so no unauthorized modifications can be made.

4) [intransitive/transitive] literary if two people's eyes lock, they look directly into each other's eyes

lock horns (with) — to become involved in something such as a fight or competition with someone

Two of Rugby League's top teams will lock horns with each other tomorrow.

locked in (a) battle/debate/dispute/negotiations etc — involved in a fight, discussion, or argument that lasts a long time

The two sides were locked in fierce debate over the proposed merger deal.

Phrasal verbs:
II UK [lɒk] / US [lɑk] noun
Word forms "lock":
singular lock plural locks
a) [countable] a part of a door, drawer, suitcase etc used for fastening it so that no one can open it. You usually open and close locks with a key, but if you pick a lock, you use something else to open it, often illegally

He slowly turned the key in the lock.

All the windows were fitted with locks.

b) a piece of equipment used for preventing someone from using a vehicle, machine etc

Use a steering-wheel lock for your car.

2) [countable] a place on a river or canal with a set of gates which open and close to allow boats in. The water can then be moved to a lower or higher level.
3) [countable] a way of holding someone so that they cannot move when you are fighting
4) [countable] computing something that prevents information on a computer from being changed or looked at by someone who does not have permission
5) [countable] in rugby, a player in the second row of the scrum
6) [countable/uncountable] British a steering wheel on full lock is turned as far as possible

Even on full lock I couldn't get round the corner.

7) locks
[plural] literary hair

her flowing golden locks

English dictionary. 2014.

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