-sə(r) noun
( -s )
Etymology: Yiddish kibitser, from kibitsen + -er
: an outsider or nonparticipant who looks on and may offer unwanted advice or comment especially at a card game
contract bridge has achieved a following both of kibitzers and players probably never surpassed in the history of any nonathletic game — New York World-Telegram
nothing can be more of a trial at the scene of an illness or an accident than a kibitzer — Robert Rice