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sit through (something)
To endure the entirety of something that one is watching or attending until it is finished. I find that I can never sit through his lecture without getting distracted and doodling in my notebook. I can't believe the kids sat through the entire movie without fidgeting.
sit through something
to remain seated and in attendance for all of something, even though it is boring or poorly done. I can't stand to sit through that class one more time! Do I have to sit through the whole lecture?
To stay until the end of something: The children will never be able to sit through a four-hour movie.