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knock verb

  /nɑk/ , /nɒk/
  • (intransitive) To rap one's knuckles against something, especially wood.
  • (transitive, Britain, slang, dated) To impress forcibly or strongly; to astonish; to move to admiration or applause.
χτυπάω

knock noun

  /nɑk/ , /nɒk/
  • (automotive, uncountable) Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it.
προανάφλεξη
  • An abrupt rapping sound, as from an impact of a hard object against wood.
  • A sharp impact.
χτύπος
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