godan verb (-ru), intransitive verb
raise overhead; brandish
Describes the action of lifting something, especially a weapon like a sword or bat, high above one's head, often in preparation to strike.
バッターはバットを振りかぶって構えた。
The batter raised the bat overhead and got ready.
侍が刀を振りかぶる姿は迫力がある
The sight of a samurai brandishing a sword overhead is powerful.