IDIOMS

An expression that typically expresses a figurative, non-literal meaning attached to the phrase is called IDIOMS. 

If you go to the USA or the UK, you'll encounter folks who use figure of speech in communicating. To give examples, let's look on the examples below.

APPLE OF THE EYE- refers to someone very precious or dear

That boy from the 5th level is apple of (my) eye.

BREAK A LEG- do your best

I heard you have a handball match this coming Wednesday. Break a leg while you're ar it!

LIVE AND LEARN - Make a mistake. 

In life,you are always faced with circumstances. Sometimes, you live and learn.

YOU CAN SAY THAT AGAIN -That's true, I agree.

Living here in Spain particularly in Basauri is best thing ever! 

Clayton: You can say that again!

WHEN PIGS FLY- something that will never happen.

Williams will only keep quiet when pigs fly.

THAT'S NOT ON!- unacceptable

This is a modern version of an even more British-sounding idiom, “that’s not cricket.”

NOT MY CUP OF TEA- not enjoyable/unlikable 

Playing rugby is not my cup of tea. 

PIECE OF CAKE- refers to something that is easy to do.

Boiling an egg is a piece of cake