oversleep /ˌoʊvɚˈsliːp/ verb oversleeps; overslept /-ˈslɛpt/ ; /ˌoʊvɚˌslɛpt/; oversleeping oversleeps; overslept /-ˈslɛpt/ ; /ˌoʊvɚˌslɛpt/; oversleeping Learner's definition of OVERSLEEP
[no object]
: to sleep past the time when you planned to get up睡过头