straw man (n.)youdaoicibaDictYouDict[straw man 词源字典]
1590s, "doll or scarecrow made of bound straw," from straw (n.) + man (n.). Figuratively, in debates, by 1896. Man of straw "imaginary opponent" is recorded from 1620s.[straw man etymology, straw man origin, 英语词源]