Definition of be on the lookout or keep a lookout for in English:

be on the lookout (or keep a lookout) for

1Be alert to (danger or trouble): he told them to be on the lookout for dangerous gas
More example sentences
  • Suspicion is a product of the need to keep a lookout for signs of trouble, potential danger and clues to offences.
  • The tough new initiative will see shops in the High Street who have signed up to the scheme receive photo albums of convicted crooks in the area so they can be on the lookout for potential trouble makers in their store.
  • Public health workers throughout the NHS have been alerted to be on the lookout for symptoms of ricin exposure in patients.
1.1Keep searching for (something that is wanted): we kept a sharp lookout for animals and saw several waterbuck
More example sentences
  • Researchers say they will be on the lookout for even more Saturn moons, and will seek close-ups of the ones just found.
  • A trainer, too, he had been renting the stables in Co Kildare, and was on the lookout for somewhere to buy.
  • Needless to say, I was on the lookout for somewhere I could get online to check my mail and browse the web a bit each day.
See parent entry: lookout

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day vinaceous
Pronunciation: vʌɪˈneɪʃəs
of the colour of red wine