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they scream to warn others
They warn you of very bad weather.
Animals use a communication signal to warn others that a predator is approaching. Birds use songs to warn others of predators.
they slap there tail to warn others
To warn others of your presence to avoid a collision.
A red flag.
Chingachgook warned the others of impending danger by tapping the boat.
If you become a psychiatrist, it would not be malpractice if you do now warn your patients about the bad things about psychiatry.
Sometimes to warn off others or to make their territory
Rabbits thump their feet to warn other rabbits of danger. Rabbits also sometimes thump their feet in anger or frustration.
honk your horn