Etymon
gem-breusta-protowest-germanic-breust-old-english-breost-middle-english-brest-english-breast-protoindoeuropean-kwel-protoindoeuropean-kwekwleh2-protogermanic-hweulo-old-english-hweol-middle-english-whel-english-wheel-english-breastwheel-from-breast-wheel
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.