drop a pinch of salt on the tail of

pinch：掐，捏，勒索，抢劫 ... upon a pinch 在紧要关头, 必要时 drop a pinch of salt on the tail of 捉住某人, 捕获某人 ...

tail... ... drop a pinch of salt on the tail of v. 诱惑,使落圈套 get a tail on sb 盯某人的梢,监视某人 ...