"treat lightly," 1520s, from trifle (n.). Earlier "cheat, mock" (c. 1300). Related: Trifled; trifling.
"to defraud by cheating" (originally especially in a game), 1580s, probably from rook (n.1) in the "cheat" sense. Related: Rooked; rooking.
"act of treachery," 1834, from double (adj.) + cross (n.) in the sense of "pre-arranged swindle or fix." Originally to win a race after promising to lose it (to cheat in cheating, hence the double). As a verb from 1903, "to cheat," American English. Related: Double-crossed; double-crosser; double-crossing.
1530s in the literal sense of "to strip (a sheep) of fleece," from fleece (n.). From 1570s in the figurative meaning "to cheat, swindle, strip of money." Related: Fleeced; fleecer; fleecing.
"to dupe, cheat, mislead by deception," 1540s, earlier "to swallow" (1520s), ultimately from gull "throat, gullet" (early 15c.); see gullet. Related: Gulled; gulling.
"treasonable or perfidious conduct," c. 1200, from Old French trecherie, tricherie "deceit, cheating, trickery, lies" (12c.), from trechier "to cheat, deceive" (see trick (n.)).
early 15c., decepcioun, "act of misleading, a lie, a falsehood," from Old French déception (13c., decepcion) or directly from Late Latin deceptionem (nominative deceptio) "a deceiving," noun of state or action from past-participle stem of Latin decipere "to ensnare, take in, beguile, cheat," from de "from" or pejorative (see de-) + capere "to take," from PIE root *kap- "to grasp."
From mid-15c. as "state of being deceived; error, mistake;" from 1794 as "artifice, cheat, that which deceives."