Meaning of “ring off” - Learner’s Dictionary

ring off

UK (UK/US hang up) phrasal verb with ring uk us /rɪŋ/ verb (past tense rang, past participle rung)

to end a telephone conversation and put down the part of the telephone that you speak into:

She'd rung off before I could say goodbye.

(Definition of “ring off” from the Cambridge Learner’s Dictionary © Cambridge University Press)