keep/have one eye/half an eye on somebody/somethingto be watching someone or something at the same time that you are doing something else 做另一件事的同时注意着某人/某物 Louise was stirring the soup with half an eye on the baby. 路易丝边搅拌汤边留神看着婴儿。
→ keep/have one eye/half an eye on somebody/something at eye1(4)