smock. 1  a loose, lightweight overgarment worn to protect the clothing while working. 2  to clothe in a smock. 3  to draw (a fabric) by needlework into a honeycomb pattern with diamond-shaped recesses.
The term lordosis refers to the normal inward lordotic curvature of the lumbar and cervical regions of the spine. Excessive curvature of the lower back is known as lumbar hyperlordosis, commonly called hollow back or saddle back (after a similar condition that affects some horses).
If the person you're viewing does not have flat low back posture, you'll likely notice a curve that goes towards the front of the body. By the way, the normal lordotic curve is part of the natural spinal alignment; it helps you to balance your body as you meet the physical demands of your daily activities.