say it: ree-THINGK
rethink is a noun and verb meaning "thinking again about a choice previously made". It carries 2 recorded senses.
thinking again about a choice previously made
“he had second thoughts about his purchase”
change one's mind
“He rethought his decision to take a vacation”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for rethink come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.