Aristophanes, Clouds 872-3 (web address 1), with explanation/paraphrase from the scholia there. Socrates, speaking to Strepsiades, is mocking Pheidippides' pronunciation of the word kre/maio in 870. (The actor playing Pheidippides would probably have pronounced his vowels in an excessively open manner, either to reflect his character's boorishness or -- as Dover tentatively suggests -- to illustrate a slackness of articulation in the general class of young men to which he assimilated himself.)
The present headword, extracted from line 873, is the perfect active participle, masculine dative plural, of the verb diarre/w, I flow through (web address 2); cf. delta 727, delta 728, delta 951.