Meaning of “rethink” - Learner’s Dictionary

rethink

verb [ I, T ] us uk /ˌriːˈθɪŋk/ past tense and past participle rethought

to change what you think about something or what you plan to do:

We've had to rethink our strategy.
rethink noun [ no plural ] us uk /ˈriːθɪŋk/

The whole issue needs a fundamental rethink.

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