keep a lookout for

US /kiːp ə ˈlʊk.aʊt fɔːr/
UK /kiːp ə ˈlʊk.aʊt fɔːr/
"keep a lookout for" picture
1.

注意して見る, 警戒する

to watch carefully for someone or something, especially to prevent danger or to find something specific

:
Please keep a lookout for the delivery truck.
配達トラックに注意して見ていてください
We need to keep a lookout for any suspicious activity.
不審な活動に警戒する必要がある