成语“捉奸见双”语见明·冯梦龙《古今小说·任孝子烈性为神》:“你且忍耐,此事须要三思而行。自古道:‘捉奸见双,抓贼见赃。’倘或不了事,枉受了苦楚。”也作“捉奸要双”、“捉奸捉双”等。常与“捉贼见赃”、“杀人见伤”等连用。成语大意是说,捉奸情要同时抓到奸夫奸妇。比喻问罪要有真凭实据。由于科学的进步,现今捉奸不一定要一举抓到奸夫和奸妇,才能定 Idioms “see the double catchup” language See Ming Feng Menglong “ancient and modern novels, as filial piety for God”: “You and patience, the matter should be thought twice. ’If nothing else, suffered in pain.’ ”“ To make ”to“ double ”, “ snatch catch double ”and so on. Often with “catch the thief see stolen ”, “kill see hurt ” and other used. Idiom to the effect that arrests at the same time caught adultery adultery. Metaphor to have a true proof of the truth. Due to the progress of science, it is not necessary to seize adulterers and adulteresses today