fill-in Synonyms

complete substitute backup fill out relief reliever sub backup man stand-in make out update standby tip off second-stringer rilievo fill up warn second shade understudy supplement surrogate surrogation tell temporary sit in locum designated hitter make aware give details to give information to put in the picture keep posted put wise bring up to speed bring up to date subject to confirmation provide a clue substitute teacher refilling pro tempore pinch hitter wise up stopgap temp report to clue in clue up let know short-term