be on the lookout for

US /bi ɑn ðə ˈlʊkˌaʊt fɔr/
UK /bi ɑn ðə ˈlʊkˌaʊt fɔr/
"be on the lookout for" picture
1.

경계하다, 찾다

to be actively watching or searching for something or someone

:
We need to be on the lookout for any suspicious activity.
우리는 어떤 의심스러운 활동이든 경계해야 합니다.
The police are on the lookout for the escaped prisoner.
경찰은 탈옥수를 찾고 있다.