wussten
Wussten is the simple past tense (Präteritum) form of the German verb wissen, which means "to know." It expresses knowledge held at a past time and is commonly used in written language, narratives, and formal contexts. The present tense of the same verb is wissen. The form wussten is used with plural subjects, as in wir wussten and sie wussten, and also with Sie in formal contexts.
The stem for the Präteritum is wusst- with the standard Präteritum endings: ich wusste, du wusstest, er
In everyday spoken German, the perfect tense with haben gewusst is often used to refer to past
wissen originates from the Germanic verb for "to know" and is related to Old High German wis(s)an
Wissen (infinitive), Gewusst (past participle), German verb conjugation.