Real Dictionary

interline in American English 1
to write or print between the lines of (a text, document, etc.)
adjective: involving or indicating a transfer of passengers or freight from one carrier to another during travel or shipment
intransitive verb: to transfer freight from one carrier to another in the course of shipment
transitive verb: to write or insert (words, phrases, etc.) between the lines of writing or print

interline in American English 2
to put an inner lining between the outer material and the ordinary lining of (a garment)
transitive verb: to provide (a garment) with an interlining

interline in British English 1
verb: to write or print (matter) between the lines of (a text, book, etc)

interline in British English 2
verb: to provide (a part of a garment, such as a collar or cuff) with a second lining, esp of stiffened material