English translation: claims/asserts/declares/argues/maintains that he is
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Explanation: Collins/Robert English-French dictionary proposes, for instance, the following example:
il s'affirme comme l'un de nos meilleurs romanciers = he is asserting himself OR establishing himself as one of our best novelists.
Collins/Robert English-French dictionary
Daphne b Sweden Local time: 04:39 Native speaker of: Greek PRO pts in pair: 85