by the bye

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ThesaurusAntonymsRelated WordsSynonymsLegend: the bye - introducing a different topic; in point of fact; "incidentally, I won't go to the party"
References in classic literature ?
His astonishment was a delightful testimony to your reputation, by the bye.
By the bye, I lost some money to you at bridge the other evening.
By the bye," said I, trying to take Captain Nemo's careless tone, "are you afraid of sharks, brave Ned?