fill-in Synonyms

complete relief fill out reliever backup man substitute backup stand-in sub second-stringer tip off update make out sit in standby fill up second shade surrogate makeshift tell temporary understudy warn locum designated hitter pinch 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 wise up stopgap temp report to clue in clue up let know short-term pro tem pro tempore give facts