断开

断开	duàn kāi	to break / to sever / to turn off (electric switch)
断	duàn	to break / to snap / to cut off / to give up or abstain from sth / to judge / (usu. used in the negative) absolutely / definitely / decidedly
开	kāi	to open (transitive or intransitive) / (of ships, vehicles, troops etc) to start / to turn on; to put in operation; to operate; to run / to boil / to write out (a prescription, check, invoice etc) / (directional complement) away; off / carat (gold) / abbr. for Kelvin, 开尔文 / abbr. for 开本, book format