关紧

关紧	guān jǐn	to close firmly / to fasten securely / to make fast / to lock
关	Guān	surname Guan
关	guān	mountain pass / to close; to shut; to turn off / to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc) / to concern; to involve
紧	jǐn	tight / strict / close at hand / near / urgent / tense / hard up / short of money / to tighten