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file in(to something or some place)
To move or process into a place or thing in a line. After being scolded, the kids filed silently into their classroom. Quick, file in before the show starts!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
file in(to) (something)
[for a line of people] to move into something or some place. The people filed into the hall quietly. Everyone filed in quietly.
See also: file
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.