Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “lock up”

lock up

(DOOR) phrasal verb with lock    /lɑk/ verb [I/T]
to make a building or room safe by locking the door and fastening the windows : Don't forget to lock up when you leave the house .
(Definition of lock up (DOOR) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of lock up

Word of the Day

drizzle

to pour liquid slowly over something, especially in a thin line or in small drops

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More