make a mountain out of a molehill
US /meɪk ə ˈmaʊntən aʊt ə ˈmoʊlhɪl/
UK /meɪk ə ˈmaʊntən aʊt ə ˈmoʊlhɪl/
1.
to exaggerate the importance of a minor problem
:
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Don't make a mountain out of a molehill; it's just a small scratch on the car.
•
She tends to make a mountain out of a molehill whenever there's a slight change in plans.