laidyoudaoicibaDictYouDict[laid 词源字典]
past tense and past participle of lay (v.). Laid-up "injured, sick," originally was a nautical term (1769) describing a ship moored in harbor. Laid off "temporarily unemployed" is from 1916. Get laid "have sex" (with someone) attested from 1952, U.S. slang. Laid-back "relaxed" is first attested 1973, perhaps in reference to the posture of highway motorcyclists. Laid up "incapacitated" originally was of ships.[laid etymology, laid origin, 英语词源]
motorcycle (n.)youdaoicibaDictYouDict
1895, a hybrid from motor + -cycle, from bicycle. Motocycle also was used late 19c.
The horse follows the crooks of a country road, but then the training of the "motorcycle" (horrid name) will inevitably straighten out the crooks in the country road, and afford long ranges of straight tracks. [Payson Burleigh, "The Age of Steel," Oct. 12, 1895]
Related: Motorcyclist.