be on the lookout for
US /bi ɑn ðə ˈlʊkˌaʊt fɔr/
UK /bi ɑn ðə ˈlʊkˌaʊt fɔr/

1.
tetikte olmak, aramak
to be actively watching or searching for something or someone
:
•
We need to be on the lookout for any suspicious activity.
Herhangi bir şüpheli faaliyete karşı tetikte olmalıyız.
•
The police are on the lookout for the escaped prisoner.
Polis, kaçan mahkumu arıyor.