Wall of Muscles Below the Ribcage
This page is the CodyCross answer for the clue below from Department Store, Group 506, Puzzle 5 (Gift Wrapping).
Question is: Wall of Muscles Below the Ribcage
and the answer is: DIAPHRAGM
Word Meaning:
DIAPHRAGM — (anatomy) In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs.
Definitions from Wiktionary.