Entry 1 sense Webster, 1913 overdress /ōv'-ẽrd-rĕsˌ/ · o·ver·dress · IPA /ˈoʊvərdrˌɛs/ 01 v. t. To dress or adorn to excess; to dress too much; to dress too formally for an informal occasion. 1. To dress or adorn to excess; to dress too much; to dress too formally for an informal occasion.