castaway (n.)youdaoicibaDictYouDict[castaway 词源字典]
late 15c., "one who is rejected," from the verbal phrase (c. 1300, literal and figurative), from cast (v.) + away (adv.). Specific sense "one adrift at sea" is from 1799. The adjective is first recorded 1540s.[castaway etymology, castaway origin, 英语词源]