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square peg in a round hole noun

  /skwɛə ˌpɛɡ ɪn‿ə ɹaʊnd ˈhəʊl/ , /skwɛəɹ ˌpɛɡ ɪn‿ə ɹaʊnd ˈhoʊl/ , /skwɛː-/
  • (idiomatic) Someone or something that does not fit well or at all in a certain setting; a misfit; hence, someone or something that will not succeed in an endeavour, except possibly with much effort and force.
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