muscle, tendon / vein, artery / reason, logic / plot, storyline / counter for long thin things; counter for roads or blocks when giving directions / lineage, descent

Counter for long, thin things.

(slang) an unexpected (intentional or accidental) exposure of a woman's breasts

breastplate, sternum

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