Meaning of “cover” - Learner’s Dictionary

cover

noun uk us /ˈkʌvər/
BOOK [ C ]

B1 the outer part of a book, magazine, etc, that protects the pages:

Her picture was on the cover of 'Vogue' magazine.
PROTECTION [ C ]

B1 something you put over something else, usually to protect it:

an ironing board cover
a lens cover
FINANCIAL [ U ]

financial protection so that you get money if something bad happens:

The policy provides £50,000 accidental damage cover.
FROM WEATHER/ATTACK [ U ]

protection from bad weather or an attack:

They took cover under some trees until the rain stopped.
FOR ILLEGAL ACTIVITY [ C ]

something used to hide a secret or illegal activity:

The club is used as a cover for a gang of car thieves.

(Definition of “cover noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)