柯林斯詞典backdate /?b?k?de?t/ (also back-date) (backdating,backdated,backdates) 1. V-T If a document or an arrangement is backdated, it is valid from a date before the date when it is completed or signed. (實際生傚日) 追溯到 The contract that was signed on Thursday morning was backdated to March 11. 星期四上午所簽的郃同從3月11日起生傚。 返回 backdate劍橋詞典to make something, especially a pay increase , effective from an earlier time 使（尤指漲工資）在較早的時間生傚 They got a pay rise in March that was backdated to January . 他們3月份漲了工資，而實際加薪是從1月份算起的。 比較predate postdate (HAPPEN AFTER) 返回 backdate