croire dur comme fer

== French == === Etymology === Literally, “believe (something) hard as iron”. === Pronunciation === IPA(key): /kʁwaʁ dyʁ kɔm fɛʁ/ === Verb === croire dur comme fer (simile, informal) to firmly believe in, to be firmly convinced of [with à ‘something’] === Further reading === “croire dur comme fer”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012 “croire dur comme fer”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012