mulct (v.)

early 15c., "to punish by a fine or forfeiture," from Latin mulctare, altered (Barnhart calls it "false archaism") from multare "punish, to sentence to pay a fine," from multa "penalty, fine," which is perhaps from Oscan or Samnite [Klein], or perhaps connected to multus "numerous, many," as "a fine is a 'quantity' one has to pay" [de Vaan]. Sense of "defraud" is first recorded 1748. Related: Mulcted; mulcting; mulctation (early 15c.).

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Definitions of mulct from WordNet
mulct (v.)
deprive of by deceit;
Synonyms: victimize / swindle / rook / goldbrick / nobble / diddle / bunco / defraud / scam / hornswoggle / short-change / con
mulct (v.)
impose a fine on;
mulct (n.)
money extracted as a penalty;
Synonyms: fine / amercement