What does overslept mean?

[Lola]

English Grammar Error, Intermediate level

ESL/EFL Test #15 "Sleep well (1)", question 4

On one occasion to her shame she slept over.

(a) On
(b) to
(c) slept over

English Grammar Error, Intermediate level

ESL/EFL Test #15 "Sleep well (1)", answer 4

On one occasion to her shame she overslept.

Correct entry: overslept
The error was: (c) slept over
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what does overslept mean?

[Mister Micawber]

.
Overslept = slept past the intended waking time.
Slept over = stayed overnight at another's home.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber