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

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

(chiefly women's speech) first person singular pronoun: I, me

as hard as one can; to the best of one's ability

(polite) first-person singular pronoun: I, me