- fundament (n.)
[fundament 词源字典]
- late 13c., "foundation, base; buttocks, anus," from Old French fondement "foundation, bottom; land, estate; anus" (12c.), from Latin fundamentum "a foundation, ground-work; support; beginning," from fundare "to found" (see bottom (n.)). So called because it is where one sits.[fundament etymology, fundament origin, 英语词源]