Meaning of “ring (sb) back” - Learner’s Dictionary

ring (sb) back

UK (UK/US call (sb) back) phrasal verb with ring uk us /rɪŋ/ verb (past tense rang, past participle rung)

B1 to telephone someone a second time, or to telephone someone who rang you earlier:

I'm a bit busy - can I ring you back later?

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