Supine/ˈsuːpaɪn/ Definition 1 of 3Pro Tip 1/3Physical Position Supine describes a specific way the body is lying down. Doctors often ask patients to assume a supine position during an examination. Pro Tip 2/3Not Face Down Supine means lying on the back, not face down—that's 'prone'. Yoga classes usually end with the participants lying supine for relaxation. Pro Tip 3/3Visible Face In supine position, the face is usually visible to someone standing over. The marble statue depicted a supine figure with a serene expression.