Phrasal verb

Here are some options:

leak - She was leaking information about the new iPhone.
expose - He exposed the company's illegal activity.
disclose - They wanted the politician to disclose his salary.

Let the cat out of the bag?

If it's not an expression like 'let the cat out of the bag' (already mentioned) or 'spill the beans', then maybe it's one of these phrasal verbs:

let out
give away
blurt out

CJ

Is there any phrasal verb starts with HEAD? or MARK

Cahaya KebahagiaanIs there any phrasal verb starts with HEAD? or MARK

None that comes to mind with the meaning you're interested in.

Maybe you're thinking of the noun "a heads-up"?

To give someone warning ~ To forewarn someone ~ To give someone a heads-up

CJ

Perhaps thats the one I look for.But, it is about warning, is not it? .TQ

Cahaya KebahagiaanBut, it is about warning, isn't it?

Yes, so maybe it's not exactly the word you want.

CJ

But I heard my friend use such phrasal verb as if she would like to say she told me the information earlier

Cahaya KebahagiaanBut I heard my friend use such phrasal verb as if she would like to say she told me the information earlier

In that case you will have to discuss it with your friend.

CJ