Here is the list of Top Ten Idiomatic Expressions according to the "Official Top List" website (link below)
That bully is about to deliver his famous knuckle sandwich.
This is an idiom that most closely translates to the English idiom "What's done is done."
An idiom is a rendition of a combination of words that have a figurative meaning. Most idioms have no clear "inventor".
Idiom is correct.
to try new things
She decided to make the most of her time in Paris by visiting all the famous landmarks and trying the local cuisine.
Andy Warhol - in 1968, he said " "In the future, everyone will be world-famous for 15 minutes."
Put him on the map means something that will make him famous or something that will force others to take notice of him.
what is a idiom about a cat
the most famous
An idiom is a form of expression in a general group or culture. Something like 'It's raining buckets.' This doesn't mean there are literal buckets falling it just means it's raining hard. You most likely will have to define what each idiom means.
"To be" is not an idiom - it's a verb.