проспать означает в английский

oversleep [overslept, overslept, oversleeping, oversleeps]▼(to sleep for longer than planned)
verb
[UK: ˌəʊv.ə.ˈsliːp] [US: ˌoʊv.ə.ˈsliːp]

sleep in▼(to sleep late)
verb
[UK: sliːp ɪn] [US: sˈliːp ɪn]