knock
nouns
the sound of knocking (as on a door or in an engine or bearing)
"the knocking grew louder"
a vigorous blow
"the sudden knock floored him"; "he took a bash right in his face"; "he got a bang on the head"
a bad experience
"the school of hard knocks"
is a type of (narrower)
unnecessary and unforeseen trouble resulting from an unfortunate event
verbs
deliver a sharp blow or push :"He knocked the glass clear across the room"
rap with the knuckles
"knock on the door"
knock against with force or violence
"My car bumped into the tree"
see also
see also
make light, repeated taps on a surface
"he was tapping his fingers on the table impatiently"
sound like a car engine that is firing too early
"the car pinged when I put in low-octane gasoline"; "The car pinked when the ignition was too far retarded"
is derived from
find fault with; express criticism of; point out real or perceived flaws
"The paper criticized the new movie"; "Don't knock the food--it's free"
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