IPA: /ˈkoʊtˌteɪl/
KK: /ˈkoʊtˌteɪl/
The part of a coat that hangs down at the back, often seen in formal wear, or the influence of a popular person or movement.
He rode on the coattails of the successful candidate to win the election.
Coattail is formed from "coat" (from Old French *cote*, meaning a garment) and "tail" (from Old English *tægel*, meaning the rear part). The word "coattail" refers to the rear part of a coat, often used metaphorically to describe someone who benefits from another's success or influence.
Think of the 'garment' ('coat') and its 'rear part' ('tail') — that's why coattail refers to the back of a coat, and it helps you remember how it can mean riding on someone else's success.