'overbid' definitions:

Definition of 'overbid'

(from WordNet)
noun
A bid that is higher than preceding bids
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) [syn: overbid, overcall]
verb
To bid for more tricks than one can expect to win,
verb
Bid more than the object is worth [ant: underbid]