knock

• Noun

  1. An abrupt rapping sound, as from an impact of a hard object against wood.
  2. A sharp impact.
  3. A criticism.
  4. A blow or setback.
  5. Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it.
  6. A batsman's innings.
  7. Synonym of hunger knock

• Verb