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Related to file out: fill out
To move or process out of a place or thing in a line. After the concert ended, everyone filed out, abuzz with excitement.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
file out (of something)
[for a line of people] to move out of something or some place. The people filed quietly out of the theater. They filed out at the end.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.