on watch for (someone or something)

Actively and attentively looking out for someone or something. You need to be on watch for suspicious people when you're out in the city this late at night. We've had to put extra inspectors on watch for counterfeit products being smuggled through the shipping yard.

See also: for, on, watch

See also:

on the watch
on the watch (for someone or something)
be on the watch
be on the watch (for someone or something)
lend (someone) (one's) ear
be wise to (someone or something)
be/get wise to somebody/something
cat around
make (one) wise to (someone or something)
put (one) wise to (someone or something)

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