oversell Syllabification: (o·ver·sell)Pronunciation: /ˌōvərˈsel/Translate oversell | into Italian Definition of oversell verb (past and past participle oversold /-ˈsōld/) [with object] sell more of (something) than exists or can be delivered:a surge in airlines overselling flights exaggerate the merits of:computer-aided software engineering has been oversoldoversell in other Oxford dictionaries Definition of oversell in the British & World English dictionary