Meaning of “file” - Learner’s Dictionary

file

verb uk us /faɪl/
PAPER [ T ] (also file away)

to put documents into an ordered system of boxes or files where you can easily find them again:

She filed all her tax returns under T.
LAW [ I,T ]

to officially state that you are going to take someone to court:

The police filed charges against the suspect.
His wife's filing for divorce.
RUB [ T ]

to rub something with a rough tool in order to make it smooth

file along/into/through, etc

to walk somewhere in a line, one behind the other:

The audience slowly filed back to their seats.

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