1Mawashi: the belt/loincloth worn by sumo wrestlers during matches.
力士は土俵に上がる前に回しをしっかり締める。
A sumo wrestler tightens his mawashi firmly before entering the ring.
回しの色は力士ごとに異なることがある。
The color of the mawashi can differ for each wrestler.
古い写真には力士の廻し姿が写っている。
Old photos show wrestlers wearing mawashi.
2A mantle or cape — a garment draped around the body (an older/less common usage).
古い劇の衣装で、俳優は黒い回しを羽織っていた。
In the old play's costume, the actor was wearing a black mantle.
彼は寒さよけに回しを肩にかけた。
He draped a mantle over his shoulders to keep warm.
3A vulgar term for gang rape (sexual assault by multiple people). It denotes a violent crime and is highly negative; use with caution.
警察はその事件を回し（輪姦）として捜査している。
The police are investigating the incident as a gang rape.
回しという言葉は被害者にとって辛い表現だとされる。
The term 'mawashi' (in this sense) is considered a painful/excruciating expression for victims.