铁证如山 (tiě zhèng rú shān) | Meaning: irrefutable evidence | Chinese Idiom with Pinyin & Origin

borne out by ironclad evidence铁案如山tiě àn rú shān

indeed · really · reliable · real · true确实què shí

reliable evidence (idiom); conclusive proof · definitive evidence真凭实据zhēn píng shí jù

be on record · can be found in (official) records · be documented有案可稽yǒu àn kě jī

(idiom) to speak with conviction言之凿凿yán zhī záo záo

irrefutable evidence