Abarcar (“to cover, take in, take on”) comes from the Latin brachium for “shoulder.”

From the same Latin root brachium, we get the English brachial: as in your brachial artery, the artery that runs down your shoulder!

The b‑r root is clearly visible from both.

Unsurprisingly, from the same root we also get the Spanish for shoulder… brazo as well as the English.… bra.