beforehand
/bɪˈfɔːhænd/adverb
- before an action or event; in advance提前, 预先, 事先：
rooms must be booked beforehand.
房间须提前预订。
短语
be beforehand with
- archaic anticipate or forestall〈古〉预防, （以抢先行动来）防止。
词源
Middle English (originally as two words)： from BEFORE+HAND; probably influenced by Old French avant main.