make a mountain out of a molehill
To think a small problem is a big one; try to make something unimportant seem important.
You're not hurt badly, Johnny. Stop trying to make a mountain out of a molehill with crying.
Sarah laughed at a mistake Betty made in class, and Betty won't speak to her; Betty is making a mountain out of a molehill.
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Source: A Dictionary of American Idioms
