sledgehammer

/S L EH1 JH HH AE0 M ER0/
noun
  1. 1

    A hammer that consists of a large, heavy, broad and flat block of metal (the head) attached to a handle typically 0.5 meter to 1 meter long. The sledgehammer's design is meant to allow it to be swung powerfully, and to distribute force over a wide area upon impact.

verb
  1. 1

    To strike with a sledgehammer.

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Source: https://en.wiktionary.org/wiki/sledgehammer