noun
a small hill or mound of earth made by a burrowing mole
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The children were instructed to measure the dimensions of the molehill for their science project.
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I accidentally stepped on a molehill in the backyard while playing with the dog.
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Don't make a mountain out of a molehill, it's just a minor issue.
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Her anxiety about the upcoming presentation was just a molehill compared to the mountain of stress she felt during finals week.