I was momentarily taken aback when the ploice officer said, "Catch you later."
"Catch you" means that they will meet up with you. They're saying they will see you later.
She wore the bright red dress hoping to catch the fancy of her handsome coworker.
I'll get in touch with you later and we'll meet for dinner.
I think I am catching a cold.Do you think you are catching a cold?
My Favorite IDIOM Is, When Pigs Fly.
Idiom
To include an idiom in an example sentence, simply incorporate the idiom naturally into the sentence to convey a figurative meaning. For example, "She had a chip on her shoulder" is an idiom meaning she was easily offended or held a grudge.
Idioms "catch on" because they are colorful ways of communicating.
An idiom usually is a sentence, or part of one. It certainly can be used as part of a sentence. The way to tell if it's an idiom is if it makes sense the way it's literally written.
The sentence is not, because an idiom is usually a phrase. The idiom is "do lunch," which means to have lunch together, usually while discussing business.
That IS a sentence.
"Throw the book at him" IS a sentence.