forfeit sth (by doing sth)
forfeit 作及物动词，宾语常为金钱、权利、机会等，表示因过错或违规而失去。
He forfeited his deposit by cancelling the booking.
他因取消预订而损失了押金。
丧失；被没收；失去
forfeiting — present participle of forfeit
弃权；被判负；没收；充公；不履行（义务）；失职；犯罪；违反；因不当行为或不遵守规定而遭受损失。
to lose or be deprived of something because of a crime, a wrong action, or failure to comply
因不当行为或不遵守规定而遭受损失。
To suffer the loss of something by wrongdoing or non-compliance
因自愿退出、未能出席或参加、或违反规则而输掉比赛或竞赛。
To lose a contest, game, match, or other form of competition by voluntary withdrawal, by failing to attend or participate, or by violation of the rules
犯有过失；犯罪；违犯。
To be guilty of a misdeed; to be criminal; to transgress.
未能履行义务。
To fail to keep an obligation.
指政府官员:依法剥夺先前所有者的财产。
Of government officials: to legally remove property from its previous owners.
一般现在时
If you break the rules, you forfeit your winnings.
如果你违反规则，你就丧失奖金。
一般过去时
He forfeited his deposit when he cancelled the order.
他取消订单时没收了押金。
现在完成时
They have forfeited their right to complain.
他们已经放弃了抱怨的权利。
规则动词，过去式与过去分词均为forfeited
If you break the rules, you will forfeit your prize.
如果你违反规则，你将丧失奖品。
用法提示：forfeit 作为及物动词，表示因违规而丧失某物。
He forfeited his deposit by cancelling the reservation.
他因取消预订而损失了押金。
用法提示：forfeit 的过去式，表示因某种行为导致失去押金。
She is forfeiting her chance to compete by arriving late.
她因迟到而正在失去参赛机会。
用法提示：forfeit 的现在分词形式，表示正在失去机会。
forfeit 作及物动词，宾语常为金钱、权利、机会等，表示因过错或违规而失去。
He forfeited his deposit by cancelling the booking.
他因取消预订而损失了押金。
体育竞赛中表示弃权或被判负；也可用被动语态 be forfeited。
The team forfeited the match by failing to arrive on time.
该队因未能按时到场而被判输掉比赛。
常见于法律语境，后接 to + 名词表示“对……的权利”。
She forfeited her right to compensation when she missed the deadline.
她因错过截止日期而丧失了获得补偿的权利。
lose 是通用词，不限于惩罚；forfeit 强调因过错或违规导致，且常带法律或规则语境。
surrender 偏主动交出，不强调过错；forfeit 偏被动受罚。
relinquish 是正式用词，强调自愿放弃，不一定因违规；forfeit 隐含惩罚性后果。
give up 更口语化，使用范围广；forfeit 常用于规则或法律场景，语气正式。
grammar · medium
易错句子He had to forfeit of his passport.
正确表达He had to forfeit his passport.
forfeit 是及物动词，直接接宾语，不需要介词 of。错误源于将其与名词结构 'the forfeit of sth.' 混淆，或受 'deprive of' 的影响；改正后去掉多余的 of 即可。
grammar · medium
易错句子The customs officer forfeited the smuggled goods.
正确表达The customs officer confiscated the smuggled goods.
forfeit 的主语是失去某物的人，而非没收物品的机关；海关官员的行为用 confiscate。若想说走私者受罚，应写 'The smuggler forfeited the goods.'
grammar · medium
易错句子I forfeited my seat to the elderly woman on the bus.
正确表达I gave up my seat to the elderly woman on the bus.
forfeit 表示因违规、受罚或未履行义务而被迫失去，不用于自愿、善意的让予；表示主动放弃座位用 give up 更准确。
作 forfeit“因违规或过失而丧失某物”之义的反义词，指继续持有或保有该物。
作 forfeit“因退出或违反规则而输掉比赛”之义的反义词，指在比赛或竞赛中获胜。
与 forfeit 的“丧失”相对，指通过努力或正当途径得到某物。
forfeit 因犯规、违约等受处罚而失去；forgo 是自己决定不做或不要，不涉及惩罚。
forfeit 是违规后被剥夺或失去；waive 是主动放弃合法权益或免除费用，出于自愿而非惩罚。
forfeit 强调违规者失去或丧失资格；confiscate 强调当局依法强制没收财物，主语是官方。
输掉比赛（因弃权或违规）
The visiting team refused to play and had to forfeit the game.
客队拒绝比赛，结果被判弃权。
失去押金
If you cancel within 24 hours, you will forfeit your deposit.
如果在24小时内取消，你将失去押金。
丧失权利
By signing this contract, you forfeit your rights to a refund.
一旦签署本合同，你就丧失了获得退款的权利。
（因违法而）丧失财产
He was ordered to forfeit all property gained through corruption.
他被责令交出通过腐败获得的所有财产。
丧失保释金
If the defendant skips town, he will forfeit bail.
如果被告逃逸，他将失去保释金。
for-（离开，错失）+ feit（做，制造；源自拉丁语 facere）。相关词：forgo、forbear（同前缀）；counterfeit、defect、effect（同根）
因违反规则而遭受处罚时，常会 forfeit（丧失）某些权利或金钱。
未满足条件时，押金常会被 forfeit，是常见的搭配对象。
比赛中因犯规或未出席被 disqualify，通常会导致 forfeit 比赛资格或成绩。
违规行为是导致 forfeit（丧失权益）的典型原因之一。
未能履行义务或未出席，可能导致 forfeit 相应的权利或保证金。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.