protendyoudaoicibaDictYouDict[protend 词源字典]
"To cause to project; to put forth, stretch forth; to thrust forward. Also figurative . Now rare", Late 15th cent.; earliest use found in Higden's Polychronicon. Partly from Anglo-Norman and Middle French protendre to extend, and partly from classical Latin prōtendere to stretch forth, extend, to hold out, to prolong, lengthen, in post-classical Latin also to portend (804, subsequently from 1250 in British sources) from prō- + tendere.[protend etymology, protend origin, 英语词源]