the.com/couple
Two of something, until someone uses it to mean five.
means A pair joined by romance, grammar, or proximity — or, casually, a small unspecified number.
from From Latin copula, a bond or tie, the same root that links copulate and the grammarian's copula — all about things fastened together.
Slippery countMeans exactly two, except when it means several.
Physics borrowed itA force couple makes things rotate, not move.
Verb tooTo couple is to fasten train cars together.