cinch

Borrowed from Occitan cencha, from Latin cincta, or from Spanish cincha (“a belt or girth”), from Late Latin cingula, from Latin cingulum. Doublet of cingle.

Compare senses at etymology 1 (a girth, a tight grip), perhaps suggesting the tactics used in the game; or perhaps from Spanish cinco (“five”), the five spots of the colour of the trump being important cards.

Uncertain; perhaps from Cinch Connectors, a Chicago-based company producing connectors.