verb (used with object), in·ter·filed, in·ter·fil·ing.
to combine two or more similarly arranged sets of items, as cards or documents, into a single file.
Origin of interfile
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
to place (one or more items) among other items in a file or arrangement
to combine (two or more sets of items) in one file or arrangement
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012