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

1.
mantenerse atento a, 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, mantente atento al camión de reparto.
•
We need to keep a lookout for any suspicious activity.
Necesitamos estar atentos a cualquier actividad sospechosa.