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Phrase(s): March comes in like a lion, and goes out like a lamb. [and] In like a lion, out like a lamb.
Prov. The month of March usually starts with cold, unpleasant weather, but ends mild and pleasant. (Either part of the proverb can be used alone.) • March certainly is coming in like a lion this year; there’s been a snowstorm every day this week. • Jill: Today is March twenty-fifth, and it’s beautiful and warm outside, when just two weeks ago, everything was covered with ice. Jane: In like a lion and out like a lamb, all right.
McGrawhill's American Idioms And Phrasal Verbs