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desultory [desultory 词源字典]: desultory: [16] Latin dēsultor designated a circus trick-rider who jumped from the back of one horse to another while they were galloping along (it was a derivative of dēsilīre, a compound verb formed from dē- ‘down’ and salīre ‘jump’, source of or related to English assail, assault, insult, salacious, salient, and sally). From it was derived an adjective dēsultōrius ‘jumping from one thing to another like a dēsultor’, hence ‘superficial’, and eventually ‘unmethodical, irregular’, the sense which survives in English.
=> assail, assault, insult, salacious, salient[desultory etymology, desultory origin, 英语词源]
cad (n.): 1730, shortening of cadet (q.v.); originally used of servants, then (1831) of town boys by students at British universities and public schools (though at Cambridge it meant "snob"). Meaning "person lacking in finer feelings" is from 1838.
A cad used to be a jumped-up member of the lower classes who was guilty of behaving as if he didn't know that his lowly origin made him unfit for having sexual relationships with well-bred women. [Anthony West, "H.G. Wells: Aspects of a Life," 1984]
jump (v.): 1520s, perhaps imitative (compare bump); another theory derives it from words in Gallo-Roman dialects of southwestern France (compare jumba "to rock, to balance, swing," yumpa "to rock"), picked up during English occupation in Hundred Years War. Superseded native leap, bound, and spring in most senses. Meaning "to attack" is from 1789; that of "to do the sex act with" is from 1630s. Related: Jumped; jumping. To jump to a conclusion is from 1704. Jumping-rope is from 1805. Jump in a lake "go away and stop being a pest" attested from 1912.
saute (n.): 1813, from French sauté, literally "jumped, bounced" (in reference to tossing continually while cooking), past participle of sauter "to jump," from Latin saltare "to hop, dance," frequentative of salire "to leap" (see salient (adj.)). As an adjective, "fried quickly," from 1869. As a verb from 1859. Related: Sauteed.
scan (v.): late 14c., "mark off verse in metric feet," from Late Latin scandere "to scan verse," originally, in classical Latin, "to climb, rise, mount" (the connecting notion is of the rising and falling rhythm of poetry), from PIE *skand- "to spring, leap, climb" (cognates: Sanskrit skandati "hastens, leaps, jumps;" Greek skandalon "stumbling block;" Middle Irish sescaind "he sprang, jumped," sceinm "a bound, jump").

Missing -d in English is probably from confusion with suffix -ed (see lawn (n.1)). Sense of "look at closely, examine minutely (as one does when counting metrical feet in poetry)" first recorded 1540s. The (opposite) sense of "look over quickly, skim" is first attested 1926. Related: Scanned; scanning.
Skee-Ball (n.): 1909, proprietary name (Skee-Ball Alley Company, Philadelphia, Pa., U.S.), the first element said to represent the old alternative spelling of ski (v.).
Skee ball bowling, in which the ball is jumped or skeed into the pockets in the same manner as a skee-jumper rises from the bump in his flight, is a new and unique hand-ball game that seems destined to great popularity. ["Popular Mechanics," July 1909]