Akkadian

ḫuṣannu - sash (CAD ḫ 259, AHw 361)

Little doubt this is a semantic shift from an unattested anatomical term (for the semantic development, cf. *ḥi/aḳ(ʷ)­ ‘hip, loin, lap’, No. 113); another meaning shift from ‘bosom, lap’ is likely represented by ḫaṣānu ‘to shelter, receive in a friendly way’ (note ḫ corresponding to Sem. *ḥ).

PWS
*ḥVṣ̂n- - lap, bosom (SED I No. 129; Kogan 2011: 218)