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"
- We keep a close watch on the prisoners.
- He was watched over by a militiaman.
- I have notified them to watch and tail him.
- The police put a watch on the suspect's house.
- We're counting on you to watch things in New York.