wait up phrasal verbphr v a) SLEEPto wait for someone to return before you go to bed 不睡等候〔某人〕 for Don’t wait up for me; I may be late. 不要熬夜等我了，我可能很晚才回来。
b) Wait up! American EnglishAmEWAIT used to tell someone to stop, so that you can talk to them or go with them 等一等！〔用于叫某人停下来以便和对方说话或同去〕 ‘Wait up!’ he called. “等一等！”他喊道。
wait up• I'll be home late tonight, so don't wait up.• Julie's parents waited up all night but she never came home.• I should go - Marie will be waiting up for me.• Wait up, you guys! I can't walk that fast.
wait for• Uncle Vernon had waited up for her.• I would wait up for him.• Don't wait up for me - I'll be very late.• He could be waiting up for me.• The Copleys won't have waited up for me.• It cockily waited up for them, then deftly sidestepped as the three came near it once again.
→ wait up at wait1(PHRASAL VERB)