none of (your) business

do not interest yourself in matters that do not involve you.

“Those children should never be left alone.” “Don't tell me what to do — it's none of your business.”

• put something on ice
• put something on the back burner
• put something on the line
• albatross around your neck
• albatross round neck
• albatross round your neck
• a leading light
• a leg up
• a leg up on
• a leg up on someone
• a leg up on something
• a leopard can't change its spots.
• a leopard doesn't change its spots.
• a level playing field
• al fresco
• a life-saver
• a lightning rod
• a likely story.
• a lingua franca
• a liquid lunch
• a list as long as arm
• a list as long as your arm
• a litmus test
• a little bird told me.
• a little bird told me so.