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Phrase(s): filter in(to some place)
1. Lit. to leak or seep into some place. • The smell of bacon cooking filtered into his room and made him wake up. • The smoke filtered in and burned our eyes. 2. Fig. [for people] to come into a place, a few at a time, over a period of time. • One by one, the guests filtered into the room. • They filtered in and started on the snacks.
McGrawhill's American Idioms And Phrasal Verbs