keep one's eyes skinned
密切监视
A:I'll be away for a moment.
A：我要离开一会儿。B:Yes? Anything I can do for you?
B：是吗?有什么要我帮忙的吗?
A:Look! I've been watching that man down in the street. He keeps peeping into the shop. Keep your eyes skinned for that guy. will you?
A：看!我一直在注意街上的那个人，他总是往商店里偷看，紧紧盯着那个家伙，好吗?B:OK.
B：好吧。