look out
phrasal verb with look verb uk/lʊk/ us/lʊk/
小心，当心
to watch what is happening and be careful
The police have warned shopkeepers to look out for forged notes. 警察已经提醒过店主要小心假钞。
B1 （用于告知某人有危险）小心，当心
said or shouted in order to tell someone that they are in danger
Look out! There's a car coming! 当心！有一辆汽车开过来了！