the.com/tail
the body's punctuation mark, wagging joy or warning you off entirely
means The flexible appendage extending from the rear of an animal's body, or by extension the trailing end or rearmost part of anything.
from From Old English 'tægl,' the hairy hindmost bit of a beast, with cousins across the Germanic family — Old High German 'zagal' among them — pointing back to a Proto-Germanic root that seems to have meant a tuft or lock of hair. The trail of meaning then grew its own tail: from animal rump to the back end of comets, coats, queues, and stories.
human relicEmbryos grow tails, then absorb them weeks later
lizard escapeMany drop their tails to flee predators alive
balance beamCheetahs steer at full sprint using their tails
mood meterDog tail wags lean right when happy
comet originComet tails always point away from the sun