chest, breast / heart, inner thoughts

What? What did you say?

to have a lump in one's throat, stomach full of food / (idiomatic) to be emotionally moved

Nothing

what / that thing (used in place of words you can't remember at the moment.)

What?, Huh?

仕える: to serve / 支える, 閊える: be blocked, choked / 使える: be serviceable

be useful, serve / be valid, be usable (e.g. a coupon at a cash register)

get stuck, get jammed

to get jammed / to become clogged / to get choked up, to feel pressure from anxiety or other strong emotion, such as in one's chest or throat