retune

verb
re·​tune | \ (ˌ)rē-ˈtün How to pronounce retune (audio) , -ˈtyün\
retuned; retuning

Definition of retune

transitive verb

: to tune (something) again or in a different way retune an engine especially : to readjust (something) in musical pitch a guitar/string that constantly needs to be retuned She retuned the banjo to G major.