keep an eye out (for (someone/something))

to watch carefully for someone or something.

Three aircraft kept an eye out for the submarine while waiting for help to arrive.

I always kept my eye out for strangers.

Related vocabulary: keep a close watch on someone/something, keep an ear out for someone/something

• have had it with something
• have had more something than has had hot dinners
• have had more something than someone has had hot dinners
• have had more than fair share of
• have had more than fair share of something
• have had more than has had hot dinners
• have had more than someone has had hot dinners
• have had more than your fair share of
• have had more than your fair share of something
• have had your chips
• have had your day
• have had your fill
• have had your fill of
• have had your fill of something
• have half a mind
• have half a mind to
• have half a mind to do something
• have half an ear on
• have half an ear on something
• have half an eye on
• have half an eye on someone
• have half an eye on something
• have hand in the till
• have hands full
• have hanging over head