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Phrase(s): Sooner than you think.
an expression stating that something will happen sooner than a time expected or just mentioned. • Sally: I’m going to have to stop pretty soon for a rest. Mary: Sooner than you think, I’d say. I think one of our tires is low. • Tom: The stock market is bound to run out of steam pretty soon. Bob: Sooner than you think from the look of today’s news.
McGrawhill's American Idioms And Phrasal Verbs