couplet

n. 对句, 对联

cou.plet

n.（名词）
A unit of verse consisting of two successive lines, usually rhyming and having the same meter and often forming a complete thought or syntactic unit.
双句：包括两个相连的诗行的一种诗的单位，通常压韵并具有同样的格律，经常组成一个完整的意思和句法单位
Two similar things; a pair.
一对，一双：两个相似的东西；一对

来源：
French
法语
from Old French [diminutive of] couple [couple] * see couple
源自 古法语 [] couple的小后缀 [一对，夫妻] *参见 couple