Go missing

Yeah, I confirm that.

But what part of speech is "missing" there?

For what it's worth, this is my take.

To these semi-native ears, I think not.

Everyone was looking for him [af

AnonymousIs "he went missing" grammatically correct?

Yes. "He got lost"; "He could no longer be found". went acts like became in this idiom, as in "The milk went bad".

CJ

AnonymousBut what part of speech is "missing" there?

Consider these samples:
My heart went cold
The phone went dead
The tyre went flat

They all bear an unmistakable resemblance to "went missing", and seeing as "cold/dead/flat" are all adjectives, it is safe to assume that "missing" is an ajective too.
Or maybe someone can pi

MrPernicketyOr maybe someone can pick my argument apart

Not gonna happen! It's too obvious that missing is an adjective.

He's missing.
She's been missing for a week.

It's missing.
What's missing?
Is anything missing?

Thanks, all. One more question: why do we mostly hear go + adjective with negative meaning?

Go bald, go deaf, go rotten... I noticed too that "go" (when it means "become") is used with unpleasant/unwanted situations. That's the way it is.

True.

went crazy, went mad, went ballistic.

But then there's went commando. Is that unpleasant or unwanted? LOL.

CJ

*get bald
go bald

*go happy
get happy

get tired
*go tired

get rich
*go rich

Interesting.