expression, godan verb (-su)
throw out one's chest; be puffed up with pride
Describes a physical posture of puffing out the chest, often from pride or confidence. Can be used literally or figuratively.
彼は胸をそらして会場に入ってきた。
He entered the venue with his chest puffed out.
成功を胸をそらして語った。
He spoke of his success with pride, throwing out his chest.