Idioms Beginning with k

• keep a lid on

  To keep something secret
  No one is supposed to know our plan. Please keep a lid on it.

• keep an eye on

  To watch intently.
  Please keep an eye on my children for me. I need to go to the store.

• keep it down

  To be quiet; to not be noisy.
  Please keep it down. I'm trying to study.

• keep one's nose to the grindstone

  To work hard or focus heavily on work
  You will do well if you keep your nose to the grindstone.

• keep your chin up

  To stay positive and not lose confidence, even in difficult situations.
  I know things are tough right now, but keep your chin up!

• keep your head above water

  To survive or manage despite difficulties, especially financial ones.
  With all these bills, I’m just trying to keep my head above water.

• kick back

  To relax.
  After work tonight, I'm going to go home and kick back.

• kick the bucket

  To die (informal and often humorous).
  The old farmer finally kicked the bucket after living a long life.

• kid around

  To engage in playful joking or teasing.
  Don't take Max seriously. He was just kidding around when he said that you were ugly.

• knock it off

  to stop doing something.
  Please knock it off. That really annoys me.