background (portion of an image or scene behind the main figure; portion less important than the figure) / one's personal background

flow, run, rush, stream / wash away / (for rumors, news, etc. to) circulate, go around / (for time to) pass / (for music or video to) play / fail, fall through / trend

background pollution, increase of pollution in areas not directly affected by the source of pollution

music

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

private; mine

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

a personal or private matter / (by extension) selfishness

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law

personal, private / secret