An idiom is a term or phrase that cannot be understood by a literal translation, but refers instead to a figurative meaning that is understood through common use.
A bird in the hand is worth two in the bush.
It is raining cats and dogs.
He is a wolf in sheep's clothing.
Whenever I see her, I have to bite my tongue.
A cliche is a phrase, expression, or idea that has been overused to the point of losing its intended force or novelty, especially when at some time it was considered distinctively forceful or novel. Note: many of these are also idioms.
A few overused sports cliches.
They've had our number all season.
They're on the ropes.
We can still hold our heads high.
They're buzzing around the net.
We only have to look in the mirror.
They have to circle the wagons.
He put the biscuit in the basket.
He's been playing steady between the pipes.
That score gives them a big cushion.
We got a wake-up call.
That really took the wind out of their sails.
That's a nail in the coffin.
This is a train wreck.