例句-2: "Did you read about that crazy guy who stole a police car to take his girlfriend to see a movie? The cop caught him in ten minutes -- it seems to me the guy was not all there."
Screw是一个螺丝,loose是松的意思。所以 to have a screw loose从字面上来解释就是:一个螺丝松了。作为一个俗语,它的意思就是:某人的脑子不正常,因为他脑子里有些地方的接头松了。我们来举个例子说明这个俗语在口语里是怎么用的。这是一个人在回忆他大学里的一个同学:
例句-3: " I knew a guy at college who had a screw loose somewhere -- he was scared to death of catching a disease so he'd run off to wash his hands after he shook hands with anybody."
例句-4: "Everybody thought these two brothers had a screw loose somewhere when they built this silly-looking machine and claimed it could carry a man up in the air. But people stopped laughing when this crazy thing actually flew."