What is the meaning of idiom him up

The phrase "him up" doesn't have a common, established meaning as an idiom in English. It's likely you've encountered a specific usage within a certain context.

Here's what's likely happening:

* Misheard or Misinterpreted: You might have misheard or misinterpreted a phrase that actually has a clear meaning. For example, "him up" might have been:

* "He's up": This means someone is awake or standing.

* "He's up to something": This means someone is engaging in suspicious or secretive activity.

* "He's up against it": This means someone is facing a difficult challenge.

* Slang or Regional Expression: It could be a slang term or regional expression that's not widely understood.

* Made-Up Phrase: Perhaps it was a creative use of language in a specific context, like a story or song.

To understand the intended meaning, you'll need more information! Could you tell me:

* The full sentence or context where you encountered the phrase?

* What was the speaker or writer trying to convey?

With more context, I can help you figure out what "him up" really means.