"the knocking grew louder"
"the sudden knock floored him"
"he took a bash right in his face"
"he got a bang on the head"
"the school of hard knocks"
"he gave the table a whack"
"He knocked the glass clear across the room"
"knock on the door"
"My car bumped into the tree"
"he was tapping his fingers on the table impatiently"
"the car pinged when I put in low-octane gasoline"
"The car pinked when the ignition was too far retarded"
"The paper criticized the new movie"
"Don't knock the food--it's free"