(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
指(ゆび)切(き)り • (yubikiri)
指(ゆび)切(き)りする • (yubikiri suru) suru (stem 指(ゆび)切(き)りし (yubikiri shi), past 指(ゆび)切(き)りした (yubikiri shita))