know enough to come in out of the rain
know enough to come in out of the rain {v. phr.}
To have good sense; know how to take care of yourself. — Usually used in the negative.
Bob does so many foolish things that his mother says he doesn't know enough to come in out of the rain.
Sally may look stupid, but she knows enough to come in out of the rain.
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Source: A Dictionary of American Idioms