Keep An Eye On Him
建议密切注意某人的行为或动向，以防出现问题。
用于提醒他人注意看管或监视某人。
英文释义
You should carefully watch him.
例句
Please keep an eye on him while I'm away.
典故来源
源自日常观察行为，用'眼睛'比喻持续关注和监视。