Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “lock”

See all translations

lock

noun [C]  /lɑk/ us  

lock noun [C] (DEVICE TO FASTEN)

a device that keeps something, such as a door or drawer, fastened, usually needing a key to open it

lock noun [C] (WATER)

a length of water with gates at either end where the level of water can be changed to allow boats to move between parts of a canal or river that are at different heights

lock noun [C] (HAIR)

a curl of hair, or a group of hairs

lock

verb [I/T]  /lɑk/ us  

lock verb [I/T] (NOT ALLOW CHANGE)

to be or hold something in a position or condition where movement, escape, or change is not possible: [T] They’re locked in a lawsuit with their former employer. [I] The cars crashed and the bumpers locked, making it impossible to move. [M] The bank won’t lock in our mortgage rate.

lock verb [I/T] (FASTEN)

If you lock something somewhere, you make it safe by putting it in a special place and fastening it closed with a lock: [T] He locked the documents in his filing cabinet.
(Definition of lock from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of lock?
Add Cambridge dictionaries to your browser to your website

Definitions of “lock” in other dictionaries

Word of the Day

escapism

a way of avoiding an unpleasant or boring life, especially by thinking, reading, etc. about more exciting but impossible activities

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

showrooming noun

February 23, 2015
the activity of examining a product in a physical store and then making the purchase with an online retailer Amazon’s new smartphone is specifically designed to make showrooming fast and easy.

Read More