on the lookout

Translations
быть начеку
He is always on the lookout for new opportunities.
Он всегда на чеку в поисках новых возможностей.
Definitions
Being vigilant or watchful for something or someone, often in anticipation of an event or situation.
Words
on

preposition
на
the

article or possessive pronoun
определённый артикль
lookout

noun
начеку