Akkadian

bamtu - chest, front of the chest (CAD B 78, AHw. 101)

Clear-cut cognates with anatomic meaning are found in Ugr. bmt “back, rump, loin” and Hbr. *bōmät “back” (HALOT 136).

PS
*p/ban/md(at)- - back, podex (SED I No. 216)

Phonetically a very difficult case; diverse phonetic processes are likely due to different patterns of compatibility of root consonants in various languages.