Often there are friendly warnings about things like trash by the pool.

But that was a friendly warning, not a threat.

Pray don't think it a liberty if I give you a word of friendly warning.

So when I ran breathless into the kitchen, he gave me a friendly warning.

Was her call a threat, however intended as friendly warning?

"Let us merely say a friendly warning," he answered lightly.

It is described clearly as a threat, not a friendly warning - but if so, why would the terrorists send the message?

We've come to see you as a friendly warning.

He had already spoken to Stevens in the nature of a friendly warning.