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know-it-all noun

  /ˈnəʉ.ɪt.oːl/
  • (chiefly, US, pejorative) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.
 Besserwisser, Rechthaber, Besserwisserin, Neunmalkluger, Klugscheißer, Klugscheißerin
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