- watch, observe, follow, watch over, keep an eye on - follow with the eyes or the mind; "Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the binoculars"
--1 is one way to check, check up on, look into, check out, suss out, check over, go over, check into
Sample sentence:
The children keep an eye on the ball