To watch for or look out for.
keep tabs on
To monitor; to keep track of; to watch.
look out for someone
To guard, protect, support; to take care of; to watch over
keep a close watch
to pay careful attention to a situation or a thing, so that you can de…
keep watch
To guard; to watch over someone or something.
keep an eye on
To watch and pay attention to, in case of misbehaviour or mishap.
watch out
To be aware or conscious; to look closely or carefully; to use caution…