endeavor, strive for, make an effort

improvement, an action taken to improve / improvement, a spontaneous change for the better

(transitive) to improve, to make better / (intransitive) for something to improve on its own

betterment, improvement, amelioration

service / giving away something or doing something for free, as a gift or free service for someone / maintenance

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

as much as possible; as far as possible; to the best of one's ability; diligently

Alternative spelling of 私達 (“we; us”)

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

a personal or private matter / (by extension) selfishness