Chest
Breasts
noun
The kanji and the word are exactly the same. That means they share meanings as well.
むね
This vocab word uses the same reading as the one you learned with the kanji. At least I won't have to bring up the image of you mooning (むね) people with your breasts or whatnot. Oh dang, I just went and did it.
希望に胸をふくらませながら、トーフグで働き始めました。
With hope swelling in my chest, I started working for Tofugu.
かにさされて胸がすごくかゆいことは、胸にしまっておいた。
I kept it to myself that I got mosquito bites on my breasts, making them very itchy.
コウイチが毎朝胸を張って歌うTofuguのテーマソングの歌詞は胸にぐっときます。
The lyrics to the Tofugu theme song, which Koichi sings every morning, with his chest puffed out, cause a swell of emotions in my own chest.