expression, godan verb (-su)
talk privately; chat
Rare prison slang for having a private conversation or chatting, often in a context where communication is restricted.
囚人たちは夜中にペラ回していた。
The prisoners were chatting privately at night.
しゃべる is a common, neutral verb for talking or chatting, while ペラ回す is rare prison slang for private talk.
The exact derivation is uncertain; ペラ may be prison slang for 'mouth' or 'talk', and 回す means 'to turn' or 'to pass around', together suggesting 'to pass words around'.