sprachen

Both spoke fluent Polish.

first/third-person plural preterite of sprechen

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(class-4, strong, transitive) to speak (some language, the truth, etc.)
(class-4, intransitive, strong) to speak, to talk, to give a speech
(class-4, strong, transitive) to say, to speak (a word, phrase, sentence, prayer, etc.)
(class-4, reflexive, strong) to have a pronunciation; to be pronounced (some way)
(class-4, strong, transitive) to pronounce (a judgment, a verdict, etc.)
(class-4, literary, poetic, strong, transitive) to say (something)
(Switzerland, bureaucratese, class-4, strong, transitive) to grant, approve (a loan, funding, etc.)