idioms involving “knock”

Knock off

To copy or imitate

“The police are investigating the factories that knock off designer handbags.”

Note: The noun is “knock-off”. “The handbag is a knock-off.”

Knockout

Something or someone that is extremely attractive

“Kondo-san is not only a knockout; she is very intelligent as well.”

Knock for a loop

To shock or amaze

“Higuchi-san's decision to sue her boss for harassment really knocked him for a loop.”

Knock them dead

Thrill an audience

“Sato-san knew she had knocked them dead when she received a standing ovation at the conclusion of her piano concert.”

Knock down

Deeply discount

“The department stores knock down the prices after Christmas.”