Definitions for "Overcall"
Keywords:  bid, opponent, bridge, opposing, verb
bid made by the opposing partnership (the side that does not include the opener) in a competitive auction. Generally, it shows a 5 card suit and could show less strength than is needed to make an opening bid. The term is particularly used for the first such bid in an auction.
to bid over an opponent's opening bid.
(bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand)
Keywords:  bet, player, bluffing, river, big
Any additional call after a bet is first called. Player A bets, player B calls, player C overcalls.
A call made after there has already been a bet and a call.
When you call a bet, even another player already have called.