boarder (n.)youdaoicibaDictYouDict[boarder 词源字典]
1520s, "one who has food and/or lodging at the house of another," agent noun from board (v.), in the "be supplied with food" sense; meaning "one who boards (an enemy's) ships" is from 1769, from a verbal sense derived from board (n.2).[boarder etymology, boarder origin, 英语词源]