nauseated / very angry or offended

full breasts / boob job, breast augmentation surgery

(ichthyology) pectoral fin

(figuratively, idiomatic) heart pounding; butterflies in one's stomach

(Internet slang) Short for 胸が熱くなる.

a badge, an insignia worn on the chest

(anatomy, uncommon, dated) cephalothorax

(idiomatic) to throw out one's chest; to be puffed up with pride

(idiomatic) to be relieved, to feel refreshed

(idiomatic) a less powerful person partners with a more powerful person, such as for practicing