noun, noun or participle which takes 'suru', intransitive verb
bolting upright; rearing up
Describes a person or animal suddenly standing or springing up straight, like a pole. Often used for a horse rearing up on its hind legs or a person jumping to their feet in surprise.
馬が驚いて棹立ちになった。
The horse reared up in fright.
彼は急に棹立ちして叫んだ。
He suddenly bolted upright and shouted.