Watch like a hawk:
To watch someone all the time, usually to make sure they do not do something bad.
“Watch (somebody/something) like a hawk（像鹰一样盯着某人或物）” 的实际意思是 “密切观察，严密监视，盯着……”。
例句
You need to watch Tom like a hawk. He has a habit of sneaking off early.
你需要盯着汤姆。他有早早溜走的习惯。
Please watch your dog like a hawk in case he runs into the road.
请你看好你的狗，以防它跑到马路上。
I’ve been watching the garden like a hawk to see if any foxes come in.
我一直在严密观察着花园，看是否有狐狸进来。
