apple pieyoudaoicibaDictYouDict[apple pie 词源字典]
attested from 1580s, from apple + pie; noted by 1893 as a typical American dish. Apple-pie bed as a name for a childish prank is recorded from 1781; supposedly from the way of making apple turnovers, but some think it a folk etymology of French nappe pliée "folded sheet."[apple pie etymology, apple pie origin, 英语词源]