A-line Definition

ālīn
adjective
Having a fitted top and a flared bottom.
An A-line dress.
American Heritage
Fitting close at the top and flaring at the bottom.
Webster's New World

Having a silhouette that replicates the letter A by flaring out from the top, like a funnel, narrow and fitted at the neck and shoulders, skimming the hips and widening toward the bottom, with little or no shaping or seaming at the waist.

Wiktionary
noun
Any article of clothing with a narrow mid-section and a flared bottom.
Wiktionary

Other Word Forms of A-line

Noun

Singular:
A-line
Plural:
a-lines

Origin of A-line

  • From garments being shaped like a capital A

    From American Heritage Dictionary of the English Language, 5th Edition

  • From A + line (“figure”)

    From Wiktionary