英语词汇xx的起源、历史背景-英语词源词典

词汇	xx
词源	XX. XX was slang for a twenty-dollar bill back in the 19th century. The term seems to have originated in about 1850, a variation on it being the double X.
随便看	black arts blackball black bart the po-8 black belt blackberry black betsy blackbirder black book black bottom blackburnian warbler black christmas black daniel black death black dog black eye black-eyed peas black friday etc black frost black goods blackguard black hand black hole black humor black ice black is beautiful

英语词源词典收录了13259条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。