n.
be sb's lookout
- (认为某人的行为不明智)是某人自己的责任,是某人自己的事
used to say that you do not think sb's actions are sensible, but that it is their own problem or responsibility.
- If he wants to waste his money, that's his lookout.
他要乱花钱,那是他自己的事。
be on the lookout (for sb/sth)
keep a lookout (for sb/sth)
- 注意;警戒;留心
to watch carefully for sb/sth in order to avoid danger, etc. or in order to find sth you want
- The public should be on the lookout for symptoms of the disease.
公众应当留心这种疾病的症状。