from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small mound of loose earth raised by a burrowing mole.
  • idiom make a mountain out of a molehill To exaggerate a minor problem.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small mound of earth created by a mole's burrowing underneath the surface of the ground.

from the GNU version of the Collaborative International Dictionary of English

  • n. A little hillock of earth thrown up by moles working under ground; hence, a very small hill, or an insignificant obstacle or difficulty.

from The Century Dictionary and Cyclopedia

  • n. A little hill, hillock, mound, or ridge of earth thrown up by moles in burrowing underground.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a mound of earth made by moles while burrowing


From mole + hill. (Wiktionary)



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