| Idiom | Meaning | Example |
| know the ropes |
know how, have much experience, learn the ropes
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Good managers know the ropes. They have skills and experience.
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| know the score |
know what is happening, in the know, know your stuff
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The leader of the party should know the score. He or she should be well informed.
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| know where we stand |
know our position, know if we have a chance, leave me hanging
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The Department hasn't replied to our application for assistance, so we don't know where we stand.
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| know which end is up |
know where you are, know what to do next
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With so many problems, he doesn't know which end is up.
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| know which side your bread is buttered on |
know who pays your salary, If you refuse extra work, you have common sense, bite the hand that feeds...
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don't know which side your bread is buttered on.
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| know your stuff |
know a lot, know facts, have the answers
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In calculus, Tara knows her stuff. She can solve difficult problems.
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| know your way around |
know how to survive, be worldly wise
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To live on the street, you have to know your way around.
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| knuckle down |
work harder, achieve more
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If you knuckle down and study, you can pass this exam.
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| knucklehead |
one who does not think, doughhead
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What a knucklehead! He made the same mistake ten times.
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| kooky |
crazy, hairbrain, nuts
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Just because I eat insects doesn't mean I'm kooky.
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