Oversleep/ˌəʊvərˈsliːp/ Definition 1 of 1Pro Tip 1/3Accidental Delay Oversleep implies an accidental delay, not a deliberate choice to rest more. I didn't mean to be late; I simply overslept. Pro Tip 2/3Missed Events Use 'oversleep' when missing appointments or important events due to sleeping too much. He overslept and missed his job interview. Pro Tip 3/3Not Habitual 'Oversleep' is typically used for one-time incidents, not regular sleeping patterns. She rarely oversleeps, but today she didn't hear her alarm.