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knuckle [knuckle 词源字典]: knuckle: [14] Knuckle originally denoted the rounded end of a bone at a joint, which sticks out when you bend the joint. This could be at any joint, including the elbow, the knee and even the joints of the vertebrae; only gradually did it become specialized to the finger joints. The word probably came from Middle Low German knökel (or a relative of it), which appears to have meant etymologically ‘little bone’. Knuckle down, in the sense ‘begin to work hard and conscientiously’, comes from the game of marbles, where players have to put their knuckles on the ground when shooting a marble with the thumb.
[knuckle etymology, knuckle origin, 英语词源]
travel: travel: [14] Travel and travail [13] are doublets – that is to say, they have a common ancestor, but have split into separate words. Their ultimate source is medieval Latin trepālium, a term for an instrument of torture made of three sharp stakes. This was a compound noun formed from Latin trēs ‘three’ and pālus ‘stake’ (source of English pale).

From it was formed a verb *trepāliāre ‘torture on the trepālium’, hence generally ‘torture’. This passed into Old French as travailler, where its reflexive use ‘put oneself to pain or trouble’ evolved to ‘work hard’. Its noun derivative travail ‘painful effort, hard work’ was borrowed by English as travail, and this quickly developed a new sense, ‘journey’ (presumably from the notion of a ‘wearisome journey’), which came to be distinguished by the spelling travel.
=> pale, three, travail
labor (v.): late 14c., "perform manual or physical work; work hard; keep busy; take pains, strive, endeavor" (also "copulate"), from Old French laborer "work, toil; struggle, have difficulty," from Latin laborare, from labor (see labor (n.)). The verb in modern French, Spanish, Portuguese means "to plow;" the wider sense being taken by the equivalent of English travail. Sense of "to endure pain, suffer" is early 15c., especially in phrase labor of child. Related: Labored; laboring.
pull (v.): c. 1300, "to move forcibly by pulling, to drag," from Old English pullian "to pluck off (wool), to draw out," of unknown origin, perhaps related to Low German pulen "remove the shell or husk," Frisian pûlje "to shell, husk," Middle Dutch polen "to peel, strip," Icelandic pula "work hard."

Early 14c. as "to pick, pull off, gather" (fruit, flowers, berries, leaves, petals, etc.); mid-14c. as "to uproot, pull up" (of teeth, weeds, etc.). Sense of "to draw, attract" (to oneself) is from c. 1400; sense of "to pluck at with the fingers" is from c. 1400. Meaning "tear to pieces" is mid-15c. By late 16c. it had replaced draw in these senses. Related: Pulled; pulling.

Common in slang usages 19c.-20c.; Bartlett (1859) has to pull foot "walk fast; run;" pull it "to run." To pull up "check a course of action" is from 1808, figurative of the lifting of the reins in horse-riding. To pull (someone's) chain in figurative sense is from 1974, perhaps on the notion of a captive animal; the expression was also used for "to contact" (someone), on the notion of the chain that operates a signaling mechanism.

To pull (someone's) leg is from 1882, perhaps on notion of "playfully tripping" (compare pull the long bow "exaggerate," 1830, and pulling someone's leg also sometimes was described as a way to awaken a sleeping person in a railway compartment, ship's berth, etc.). Thornton's "American Glossary" (1912) has pull (n.) "a jest" (to have a pull at (someone)), which it identifies as "local" and illustrates with an example from the Massachusetts "Spy" of May 21, 1817, which identifies it as "a Georgian phrase." To pull (one's) punches is from 1920 in pugilism, from 1921 figuratively. To pull in "arrive" (1892) and pull out "depart" (1868) are from the railroads.

To pull (something) off "accomplish, succeed at" is originally in sporting, "to win the prize money" (1870). To pull (something) on (someone) is from 1916; to pull (something) out of one's ass is Army slang from 1970s. To pull rank is from 1919; to pull the rug from under (someone) figuratively is from 1946.
root (v.2): "cheer, support," 1889, American English, originally in a baseball context, probably from root (v.1) via intermediate sense of "study, work hard" (1856). Related: Rooted; rooting.
sweat (v.): Old English swætan "perspire," also "work hard," from Proto-Germanic *swaitjan "to sweat," from the source of sweat (n.). Compare Frisian swette, Dutch zweeten, Danish svede, German schwitzen. Meaning "to be worried, vexed" is recorded from c. 1400. Transitive sense is from late 14c. Related: Sweated; sweating. Sweating sickness was a sudden, often-fatal fever, accompanied by intense sweating, that struck England 1485 and returned periodically through mid-16c., described in the original citation (a chronicle from 1502) as "a grete deth and hasty."
toil (v.): early 14c., toilen, "pull at, tug," from Anglo-French toiller, Old French toellier "pull or drag about" (see toil (n.1)). Intransitive meaning "struggle, work hard, labor for considerable time" is from late 14c., perhaps by influence of till (v.). Related: Toiled; toiling.