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Most Common American Idioms
## 723. Knock into a cocked hat
## 724. Knock it off
## 725. Knock on wood
## 726. Knock someone's socks off
## 727. Know the ins and outs
## 728. Know the ropes
## 729. Know which way the wind is blowing
## 730. Know your onions
## 731. Know zip
## 732. Knuckle under
## 733. Labor of love
## 734. Laid off
## 735. Lap of luxury
## 736. Last but not least
## 737. Last straw
## 738. Last-ditch effort
## 739. Laugh all the way to the bank
## 740. Lay an egg
## 741. Lay down the law
## 742. Lead someone around by the nose