Akkadian

mešrêtu (pl. t.) - limbs (CAD M₂ 40, AHw. 649)

with a meaning shift

PS
*ŝVry/w/ˁ-, *ŝVry/ ˁ-ān- - (Achilles) tendon; sinew, muscle (of leg) (SED I No. 268)
A very difficult case (v. SED I).