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Phrase(s): trickle out (of something)
1. Lit. [for a liquid] to leak or dribble out of something or a place. • The oil trickled out of the engine little by little. • It trickled out and made a puddle on the floor. 2. Fig. [for someone or something] to go out of something or a place, a few at a time. • The dissatisfied members of the audience trickled out of the theater three and four at a time. • They trickled out as the evening wore on.
McGrawhill's American Idioms And Phrasal Verbs