| Idiom | Meaning | Example |
| knock up [B] |
become pregnant, in a family way
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She doesn't want to get knocked up, so she uses a contraceptive.
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| knock you down a peg |
say you are too proud, put him in his place
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If you are too cocky, Don will knock you down a peg.
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| knock you out |
amaze you, blow your mind
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You should see The Phantom of the Opera. It'll knock you out.
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| knock your socks off |
surprise you, perform better than you expect
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This music will knock your socks off! It's rock and roll!
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| knocked out |
eliminated from a competition or series
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Our team was knocked out during the semi-final games.
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| knockout |
stunning appearance, beautiful body
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When Jackie wears that red party dress, she's a knockout.
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| know better |
know you should not do that
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Why did you take the candy? You know better than to steal.
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| know inside out |
know a method well, know an occupation well
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After 30 years in real estate, he knows the business inside out.
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| know like the back of your hand |
know an area well, know every feature of the land
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I lived here for years. I know this town like the back of my hand.
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| know the first thing... |
(See don't know the first thing about)
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