Old English sceacan "move (something) quickly to and fro, brandish; move the body or a part of it rapidly back and forth;" also "go, glide, hasten, flee, depart" (cf. sceacdom "flight"); of persons or parts of the body, "to tremble" especially from fever, cold, fear" (class VI strong verb; past tense scoc, past participle scacen), from Proto-Germanic *skakanan (cf. Old Norse, Swedish skaka, Danish skage "to shift, turn, veer"). No certain cognates outside Germanic, but some suggest a possible connection to Sanskrit khaj "to agitate, churn, stir about," Old Church Slavonic skoku "a leap, bound," Welsh ysgogi "move."
Of the earth in earthquakes, c.1300. Meaning "seize and shake (someone or something else)" is from early 14c. In reference to mixing ingredients, etc., by shaking a container from late 14c. Meaning "to rid oneself of by abrupt twists" is from c.1200, also in Middle English in reference to evading responsibility, etc. Meaning "weaken, impair" is from late 14c., on notion of "make unstable."
To shake hands dates from 1530s. Shake a (loose) leg "hurry up" first recorded 1904; shake a heel (sometimes foot) was an old way to say "to dance" (1660s); to shake (one's) elbow (1620s) meant "to gamble at dice." Phrase more _____ than you can shake a stick at is attested from 1818, American English. To shake (one's) head as a sign of disapproval is recorded from c.1300.
late 14c., "charge, onrush," from shake (v.). Meaning "a hard shock" is from 1560s. From 1580s as "act of shaking;" 1660s as "irregular vibration." The hand-grip salutation so called by 1712. As a figure of instantaneous action, it is recorded from 1816. Phrase fair shake "honest deal" is attested from 1830, American English. The shakes "nervous agitation" is from 1620s. Short for milk shake from 1911. Dismissive phrase no great shakes (1816, Byron) perhaps is from dicing.
late 13c., from a Scandinavian source akin to Old Norse leggr "leg, bone of the arm or leg," from Proto-Germanic *lagjaz, with no certain ulterior connections, perhaps from a PIE root meaning "to bend" [Buck]. Cf. German Bein "leg," in Old High German "bone, leg." Replaced Old English shank. Of furniture supports from 1670s. The meaning "a part or stage of a journey or race" (1920) is from earlier sailing sense of "a run made on a single tack" (1867), which was usually qualified as long leg, short leg, etc. Slang phrase shake a leg "dance" is attested from 1881. To be on (one's) last legs "at the end of one's life" is from 1590s.
"to use the legs; walk or run," c.1500 (from the beginning usually with it); from leg (n.).
One of the two lower limbs of the human body, especially the part between the knee and the foot.
A supporting part resembling a leg in shape or function.
To hurry; speed up (1904+)
(also leg it) To go; travel: I was legging down the line (1601+)