When there's nothing new airing, it's a good time to catch up on old series.
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Post-2015 streaming-era slang. 补 here carries the sense of 'making up' for missed episodes. Sister terms: 追剧 (follow a currently-airing show), 刷剧 (rewatch / plow through). Not used for movies — for those you'd say 补电影 or just 看.
