Etymology
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pawn (n.1)

"something given or deposited as security," as for money borrowed, late 15c. (mid-12c. as Anglo-Latin pandum), from Old French pan, pant "pledge, security," also "booty, plunder," perhaps from Frankish or some other Germanic source (compare Old High German pfant, German Pfand, Middle Dutch pant, Old Frisian pand "pledge"), from West Germanic *panda, which is of unknown origin.

The Old French word is formally identical to pan "cloth, piece of cloth," from Latin pannum (nominative pannus) "cloth, piece of cloth, garment" and this formerly was suggested as the source of both the Old French and West Germanic words (on the notion of cloth used as a medium of exchange), but Century Dictionary notes that "the connection seems to be forced."

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pawn (n.2)

"lowly chess piece, a piece of the lowest rank and value in chess," late 14c., poune, from Anglo-French poun, Old French peon, earlier pehon "a foot-soldier; a pawn at chess," from Medieval Latin pedonem "foot soldier," from Late Latin pedonem (nominative pedo) "one going on foot," from Latin pes (genitive pedis) "foot," from PIE root *ped- "foot." The chess sense was in Old French by 13c. Figurative use, of persons, is by 1580s, but Middle English had rook and pawn "high and low persons," thus "everyone."

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pawn (v.)

"to give or deposit (something) as security" in exchange for the payment of money borrowed, etc., 1560s, from pawn (n.1). Related: Pawned; pawning.

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pawnbroker (n.)

"one licensed to lend money at interest on pledge or deposit of goods," 1680s, from pawn (n.1) + broker (n.).

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pawnshop (n.)

also pawn-shop, "pawnbroker's establishment," by 1763, from pawn (n.1) + shop (n.).

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pioneer (n.)

1520s, "one of a party or company of foot soldiers furnished with digging and cutting equipment who prepare the way for the army," from French pionnier "foot-soldier, military pioneer," from Old French paonier "foot-soldier" (11c.), extended form of peon (see pawn (n.2)). Figurative sense of "a first or early explorer, person who goes first or does something first" is from c. 1600. Related: Pioneers.

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peon (n.)

in Spanish America, "unskilled worker," formerly in Mexico especially "a type of serf held in servitude by his creditor until his debts are worked off,"  1826, from Mexican Spanish peon "agricultural laborer" (especially a debtor held in servitude by his creditor), from Spanish peon "day laborer," also "pedestrian," originally "foot soldier," from Medieval Latin pedonem "foot soldier" (see pawn (n.2)). The word entered British English earlier (c. 1600) in the sense "native constable, soldier, or messenger in India," via Portuguese peao "pedestrian, foot soldier, day laborer."

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*ped- 

Proto-Indo-European root meaning "foot."

It forms all or part of: antipodes; apodal; Arthropoda; babouche; biped; brachiopod; cap-a-pie; centipede; cephalopod; cheliped; chiropodist; expedite; expedition; foot; foosball; fetch (v.); fetter; fetlock; gastropod; hexapod; impair; impede; impediment; impeach; impeccable; isopod; millipede; octopus; Oedipus; ornithopod; pajamas; pawn (n.2) "lowly chess piece;" peccadillo; peccant; peccavi; pedal; pedestrian; pedicel; pedicle; pedicure; pedigree; pedology; pedometer; peduncle; pejoration; pejorative; peon; pessimism; petiole; pew; Piedmont; piepowder; pilot; pinniped; pioneer; platypus; podiatry; podium; polyp; pseudopod; quadruped; sesquipedalian; stapes; talipes; tetrapod; Theropoda; trapezium; trapezoid; tripod; trivet; vamp (n.1) "upper part of a shoe or boot;" velocipede.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pad-, accusative padam "foot;" Avestan pad-; Greek pos, Attic pous, genitive podos; Latin pes, genitive pedis "foot;" Lithuanian padas "sole," pėda "footstep;" Old English fot, German Fuß, Gothic fotus "foot."

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hock (v.)
"to pawn," 1878, from hock (n.3). Related: Hocked; hocking.
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gage (n.)
"a pledge, a pawn, something valuable deposited to insure performance," especially "something thrown down as a token of challenge," c. 1300, from Old French gage "pledge (of battle), security, guarantee; pay, reward" (11c.), from Frankish *wadja-, from Proto-Germanic *wadi- (see wed). Italian gaggio, Spanish and Portuguese gage are French loan-words.
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