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

1.
ficar de olho em, estar atento a
to watch carefully for someone or something, especially to prevent danger or to find something specific
:
•
Please keep a lookout for the delivery truck.
Por favor, fique de olho no caminhão de entrega.
•
We need to keep a lookout for any suspicious activity.
Precisamos ficar de olho em qualquer atividade suspeita.