挂断

挂断	guà duàn	to hang up (a phone)
挂	guà	to hang; to suspend (from a hook etc) / to hang up (the phone) / (of a line) to be dead / to be worried; to be concerned / (dialect) to make a phone call / to register (at a hospital); to make an appointment (with a doctor) / (slang) to kill; to die; to be finished; to fail (an exam) / classifier for sets or clusters of objects
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