knock - noun

the sound of knocking (as on a door or in an engine or bearing)

negative criticism

a vigorous blow

a bad experience

the act of hitting vigorously

knock - verb

• deliver a sharp blow or push :
• rap with the knuckles
• knock against with force or violence
• make light, repeated taps on a surface
• sound like a car engine that is firing too early
• find fault with; express criticism of; point out real or perceived flaws

knock - thesaurus

bang   bash   belt   bump   criticise   criticize   knocking   ping   pink   rap   roast   smash   tap   whack   whang