give warning

Nothing, on Ragnarok, ever seemed to give warning before it killed.

They stationed watchmen on the hills to give warning of the approach of the enemy.

This would have been an excellent watch-dog to give warning of the approach of enemies.

Small silver coins indicate poverty, and large ones give warning of early misery.

I am strongly solicited to prevail on him to take another walk, and then to give warning to my friends.