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.