also: からふかし
engine idling; revving in neutral
Refers to running an engine without engaging the transmission, often with the accelerator pressed. Common in automotive contexts.
Revving the engine while waiting at a traffic light bothers the neighbors.
Idling the engine worsens fuel efficiency.
Alternate spelling using 吹かす; also read からふかし.
Alternate reading for 空吹かし; less common than からぶかし.
Compound of 空 (から, 'empty') and 吹かし (ふかし, nominalized form of 吹かす 'to blow/rev'). Literally 'empty revving'.