expression, godan verb (-su)
bare one's back; expose one's back
Used when someone intentionally or unintentionally reveals their back, e.g., by lifting clothing or turning around.
彼はシャツを脱いで背中を出した。
He took off his shirt and bared his back.
ドレスは背中を出すデザインだ。
The dress has a design that exposes the back.
Compound of 背中 (back) + を (object marker) + 出す (to put out, to expose). The literal meaning is 'to put out one's back'.