weigh up phr v [T] 1 [ weigh sth ↔ up] to consider something carefully 仔细考虑，权衡: She weighed up the options before giving her decision. 她仔细考虑各种选择后才作出决定。 2 [ weigh sb up] to think carefully about what someone is like and form an opinion about them 对〔某人〕作估量［判断］