K
(as of Dec 16, 2007)- Keep a Straight Face

- Keep Your Shirt On
- Keep Your Eye on the Prize
- Kick the Bucket
- Knock on Wood
- Know the Ropes

Sample Idiom
Knock on Wood
Sentence
It's a good thing I knocked on the wood, as nothing bad happens to our family when
the typhoon came.
Explanation
people believes knocking on wood brings good luck or better luck
Origin
The term was believed to be associated with Christian religious cross which is
made of wood.

