mis ‧ hear /ˌmɪsˈhɪə $ -ˈhɪr/ BrE AmE verb ( past tense and past participle misheard /-ˈhɜːd $ -ˈhɜːrd/) [intransitive and transitive]
to not hear properly what someone says, so that you think they said something different:
It seemed a strange question; I wondered if I had misheard.
You must have misheard him.