(v) lose (s.th.) or lose the right to (s.th.) by some error, offense, or crime, Syn. give up, throw overboard, forego, waive, forgo, Ant. claim, Example:you've forfeited your right to name your successor; forfeited property
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
adv. Over the side of a ship; hence, from on board of a ship, into the water; as, to fall overboard. [ 1913 Webster ]
To throw overboard, to discard; to abandon, as a dependent or friend. -- To go overboard, to go to an extreme; to overdo; as, he went overboard at the buffet and got an upset stomach. [ 1913 Webster +PJC ]
[刻舟求剑 / 刻舟求劍, kè zhōu qiú jiànㄎㄜˋ ㄓㄡ ㄑㄧㄡˊ ㄐㄧㄢˋ] lit. a notch on the side of a boat to locate a sword dropped overboard (成语 saw); fig. an action made pointless by changed circumstances#108584