warn

an unofficial warning

a national warning system

Let that be a warning to you.

a warning light; warning words.

look out for the early warning signals.

It is incumbent upon you to warn them.

give sb. a warning look

The warning failed to register.

They warned him to stay away.

a warning against complacency

Some prevision warned the explorer of trouble.

She winked a warning to the talkative boy.

I’ve warned him a thousand times.

The policeman fired a warning shot.

he warns against the dangers attendant on solitary life.

the Chancellor warned the cabinet to axe public spending.

a warning to men harassing girls at work.

friends of hers warned her.

So don't say I didn't warn you.

Aspiring archaeologists should be warned that this happens only very rarely.

A pollution warning system is being established.

They warned me, you know. - Who warned you?

I almost fell down like you warned me.

Dobby warned and warned Harry Potter. Ah sir, why didn't you heed Dobby?

I'm sorry I didn't warn you first.

They hadn't even been warned it was happening.

Well, yes, but… - Why wouldn't you warn me?

You didn't listen to me after I warned you.