From Longman Dictionary of Contemporary Englishmolehillmole‧hill /ˈməʊlˌhɪl $ ˈmoʊl-/ noun [countable] HBAa small pile of earth made by a mole → make a mountain out of a molehill at mountain(4)
Examples from the Corpus
molehill• They were too embarrassed or didn't want to make a mountain out of a molehill.• Trust a woman to make a mountain out of a molehill!• You're making a mountain out of a molehill, Dorothy.• The other experts thought he was making a mountain out of a molehill.• No sense in making a mountain over a molehill.• They have a knack for turning molehills into mountains. 