presume (v.)youdaoicibaDictYouDict[presume 词源字典]
late 14c., "to take upon oneself, to take liberty," also "to take for granted, presuppose," especially overconfidently, from Old French presumer (12c.) and directly from Latin praesumere "anticipate," in Late Latin, "assume" (see presumption). Related: Presumed; presumedly; presuming.[presume etymology, presume origin, 英语词源]