noun
facing upward; on one's back
Describes a position where the face or front side is turned upward. Often used with verbs like 寝る, 倒れる, or する to indicate lying on one's back.
See also: 俯き
彼は仰向きに寝ていた。
He was lying on his back.
赤ちゃんを仰向きに寝かせてください。
Please lay the baby on its back.
俯き means 'facing downward' or 'looking down', the opposite of 仰向き.
Compound of 仰 (ao, 'upward') + 向き (muki, 'direction, facing'). The reading あおむき is standard.