Definition of molehill noun from the Oxford Advanced American Dictionary

 

molehill

 noun
noun
NAmE//ˈmoʊlhɪl//
 
 
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  • a small pile of earth that a mole 1leaves on the surface of the ground when it digs underground
  • Idioms
    make a mountain out of a molehill(disapproving)
     
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    to make an unimportant matter seem important
    See the Oxford Advanced Learner's Dictionary entry: molehill