隐蔽待机以出其不意;伏击;埋伏以待
lie in wait (for sb)
to hide, waiting to surprise, attack or catch sb
He was surrounded by reporters who had been lying in wait for him.他被暗中守候他的记者团团围住。
释义来自《牛津高阶英汉双解词典》第 9 版