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they scream to warn others
Animals use a communication signal to warn others that a predator is approaching. Birds use songs to warn others of predators.
They warn you of very bad weather.
A red flag.
they slap there tail to warn others
To warn others of your presence to avoid a collision.
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
Definitely tell people! They need to know!
By its odor that it lets off to warn others to stay away