croire dur comme fer

Literally, “believe (something) hard as iron”.

• IPA^(key): /kʁwaʁ dyʁ kɔm fɛʁ/

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croire dur comme fer

1. (simile, informal) to firmly believe in, to be firmly convinced of [with à ‘something’]

• “croire”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.
• “dur”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.