From Longman Dictionary of Contemporary Englishdrive-throughˈdrive-through (also drive-thru) noun [countable] BTTCa restaurant, bank etc where you can be served without getting out of your car
Examples from the Corpus
drive-through• And the drive-throughs are proving to be lucrative ventures.From Longman Business Dictionarydrive-throughˈdrive-through adjective [only before a noun] American English a drive-through bank, restaurant etc is one that you can use without getting out of your cardrive-through pizza restaurants —drive-through noun [countable] 