prone, supine, prostrate, recumbent mean lying down. prone implies a position with the front of the body turned toward the supporting surface <push-ups require a prone position>. supine implies lying on one's back and suggests inertness or abjectness <lying supine on the couch>. prostrate implies lying full-length as in submission, defeat, or physical collapse <a runner fell prostrate at the finish line>. recumbent implies the posture of one sleeping or resting <a patient comfortably recumbent in a hospital bed>.