The phrase "tapered tail" refers to a tail that starts thick at the base and gradually becomes thinner towards the end. Imagine a tail that looks like a cone shape, wider at the start and narrower as it goes towards the tip. Full definition
A long, gracefully tapered tail completes the wild appearance of this breed. (cat-lovers-only.com)
The luggage hatch is seamlessly integrated into the long, tapered tail end with flat C pillars; the spoiler lip and diffuser insert provide contrast and emphasise the sporty characteristics of the body contour. (ausmotive.com)
Individual birds can grow up to three feet in length, with nearly half that length consisting of long, tapered tail feathers. (discovermagazine.com)