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Sense: 1-3, 5-9
Origin: Old English loc
Sense: 4
Origin: Old English locc

lock

2 noun
     
lock
lock2 S2
1

fastening

[countable]D a thing that keeps a door, drawer etc fastened and is usually opened with a key or by moving a small metal bar:
I'm sorry, there isn't a lock on the bathroom door.
The key turned stiffly in the lock.
a bike lock
2

under lock and key

a) kept safely in a box, cupboard etc that is locked:
Dad keeps all his liquor under lock and key.
b) kept in a place such as a prison
3

lock, stock, and barrel

including every part of something:
He moved the whole company, lock, stock, and barrel, to Mexico.
4

hair

a) [countable]DCB a small number of hairs on your head that grow and hang together
lock of
He gently pushed a lock of hair from her eyes.
b)

locks

[plural] literaryDCB someone's hair:
long flowing locks
5

on a river etc

[countable]TTW a part of a canal or river that is closed off by gates so that the water level can be raised or lowered to move boats up or down a slope
6

in a fight

[countable]DSO a hold which wrestlers use to prevent their opponent from moving:
a head lock
7

vehicle

[uncountable and countable] British EnglishTTC the degree to which a vehicle's steering wheel can be turned in order to turn the vehicle
8

rugby

[countable] a playing position in the game of rugby
9

a lock on something

American English complete control of something:
Pro football still has a lock on male viewers aged 18 to 34.

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