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Phrase(s): trickle in(to something)
1. Lit. [for a liquid] to seep or dribble into something or a place. • Some of the rainwater trickled into my car through a leak. • It trickled in during the night. 2. Fig. [for someone or something] to come into something or a place, a few at a time. • The audience trickled into the hall little by little. • They trickled in over a period of an hour or more.
McGrawhill's American Idioms And Phrasal Verbs