the.com/wishbone

means The forked bone in a bird's breastbone, traditionally pulled apart by two people in a game where the one left holding the larger piece is said to get their wish.

from A plain English compound — "wish" plus "bone" — that names the bone for the custom rather than the anatomy; anatomists call it the furcula, Latin for "little fork." The wish-pulling tradition is old, often traced to the Etruscans, who treated fowl as oracles, and passed through the Romans to Britain. The word itself is comparatively young, an American coinage of the 19th century; the British long called the same bone the "merrythought," a lovely older name for the merry thoughts (and wishes) the breaking was meant to invite.