This is the 14413th most frequent Russian word.
отсидел
"Отсидел" means "served time" (typically in prison).
The word 'отсидел' here refers to serving a sentence in prison.
Он отсидел в тюрьме пять лет за кражу.
He served five years in prison for theft.
In this usage, 'отсидел' means to sit through or attend an event diligently.
Студент как следует отсидел всю лекцию, делая заметки.
The student properly sat through the entire lecture, taking notes.
In this sentence, 'отсидел' implies causing one’s limb to lose sensation due to prolonged sitting.