pawnyoudaoicibaDictYouDict[pawn 词源字典]
pawn: English has two words pawn. The older, ‘chess piece’ [14], means etymologically ‘footsoldier’. It comes via Anglo-Norman poun from medieval Latin pedō ‘infantryman’, a derivative of Latin pēs ‘foot’ (to which English foot is related). The foot-soldier being the lowest of the low in the army, the term came to be applied to the ‘chess piece of lowest rank’. (English gets pioneer from a derivative of paon, the Old French version of poun.) Pawn ‘pledge as security for a loan’ [15] comes via Old French pan ‘security, pledge’ from a prehistoric West Germanic *panda (source of modern German pfand ‘pledge, security, pawn’). Penny may go back to the same source.
=> foot, pedal, pioneer; penny[pawn etymology, pawn origin, 英语词源]
pawn (n.1)youdaoicibaDictYouDict
"something left as security," 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, of unknown origin.

The Old French word is identical to pan "cloth, piece of cloth," from Latin pannum (nominative pannus) "cloth, piece of cloth, garment" and Klein's sources feel this is the source of both the Old French and West Germanic words (perhaps on the notion of cloth used as a medium of exchange).
pawn (n.2)youdaoicibaDictYouDict
lowly chess piece, late 14c., from Anglo-French poun, Old French peon, earlier pehon, 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- (1) "a foot" (see foot (n.)). The chess sense was in Old French by 13c. Figurative use, of persons, is from 1580s.
pawn (v.)youdaoicibaDictYouDict
"to give (something) as security in exchange for," 1560s, from pawn (n.1). Related: Pawned; pawning.