Entry 2 senses · 2 variants Webster, 1913 Oversleep /ōvˌ-ẽrs-lēp'/ · O·ver·sleep · IPA /oʊvəɹˈslip/ v. t. v. i. 01 v. t. To sleep beyond; as, to oversleep one's self or one's usual hour of rising. 1. To sleep beyond; as, to oversleep one's self or one's usual hour of rising. 02 v. i. To sleep too long. 1. To sleep too long.