He lifted his t-shirt and showed us a long scar, running from sternum to waistband.
He considers it the usual crazy talk until one night when his sternum is nearly crushed by a snarling, otherworldly apparition.
Then you get a gander at the full monty, as it were, and he looks like someone inflated him from the sternum down.
1660s, from Greek sternon "chest, breast, breastbone" (in Homer, only of males), from PIE *stre-to- "to stretch, extend," from a root meaning "flat surface," related to stornynai "to spread out" (see structure (n.)), on the notion of the chest as broad and flat, as opposed to the neck.
sternum ster·num (stûr'nəm)
n. pl. ster·nums or ster·na (-nə)
A long flat bone, articulating with the cartilages of the first seven ribs and with the clavicle, forming the middle part of the anterior wall of the thorax, and consisting of the corpus, manubrium, and xiphoid process. Also called breastbone.
A long, flat bone located in the center of the chest, serving as a support for the collarbone and ribs. Also called breastbone. See more at skeleton.