Definition of "file in" []

• To enter in single file. (verb)

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• "For Japanese radio orders directing warships to standby locations, see the Special Research Navy SRN file in RG 457, and the Daily Chronology of Station H, dated Nov. 15–30, 1941 in RG 38, MMRB, at Archives II."
• "“Antonova,” reads the woman from a file in her hand, and our eyes all turn to Anya Antonova, a girl with a red braid down her back who gets up and obediently follows the woman into a vast room behind the door."
• "I returned home and remembered thinking that my nature would normally have been to riffle through every drawer and file in the house again, bound and determined to find our copies of those documents."