Meaning of “cover sth up” - Learner’s Dictionary

cover sth up

phrasal verb with cover us uk /ˈkʌvər/ verb [ T ]

to put something over something else, in order to protect or hide it:

We used a picture to cover up a hole in the wall.

(Definition of “cover sth up phrasal verb, verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)