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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.