Wiktionary
vb. 1 To maintain vigilance for someone or something. 2 To maintain vigilance for a possibly dangerous situation.
Usage examples of "keep a lookout".
I wanted to ask them to keep a lookout for Skeeve, but Eskina kept telling me to save it for the Barista.
They had had to decide whether to keep a lookout on the premises or whether to go in right then and there.
I'd warned Thomas to keep a lookout for any sort of package that Miss Bellman took charge of.
Still, it will be a good idea if for a while we keep a lookout for anyone tryin' to sneak up on us from the down-wind side.
Still, it will be a good idea if for a while we keep a lookout for anyone tryin' to sneak up on us from the downwind side.
I'll keep a lookout for any possible surprises from the unknown enemy but we already know that events occurring behind that time curtain take about 72,000 times longer to happen.
We were to keep a lookout for A Company, which was supposed to link up with us later in the day.
Not only had he to keep a lookout for his quarry, but he had to avoid rocks and hillocks which might suddenly rear up in the track of the sub.
Still, it willbe a good idea if for a while we keep a lookout foranyone tryin' to sneak up on us from the down-wind side.
He should keep a lookout for tracks, and be careful of overhanging branches: he doesn’.