overbid (Noun) — A bid that is higher than preceding bids.
overbid (Noun) — (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).
overbid (Verb) — (bridge) to bid for more tricks than one can expect to win,.
overbid (Verb) — (auction) bid more than the object is worth.