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have a screw loose

have a screw loose  {v. phr.},  {slang}
Поступать странным образом, совершать странные поступки; дурачиться.
Now I know he has a screw loose — he stole a police car this time.
He was a smart man but had a screw loose and people thought him odd.
Категории: {slang} {v. phr.}