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Phrase(s): fly by
1. Lit. to soar past, flying. • Three jet fighters flew by. • A huge hawk flew by, frightening all the smaller birds. 2. Fig. [for time] to go quickly. • The hours just flew by, because we were having fun. • Time flew by so fast that it was dark before we knew it.
McGrawhill's American Idioms And Phrasal Verbs