Forfeit
Middle English (originally denoting a crime or transgression, hence a fine): from Old French forfet, forfait, past participle of forfaire ‘transgress’, from for- ‘out’ (from Latin foris ‘outside’) + faire ‘do’ (from Latin facere ).
wiktionary
Middle English forfait from ca. 1300, from Old French forfait(“crime”), originally the past participle of forfaire(“to transgress”), and Medieval Latin foris factum. During the 15th century, the sense shifted from the crime to the penalty for the crime.
etymonline
forfeit (n.)
late 14c., forfet, "misdeed, offense against established authority," also "something to which the right is lost through a misdeed," from Old French forfet, forfait "crime, punishable offense" (12c.), originally past participle of forfaire "transgress," from for- "outside, beyond" (from Latin foris; see foreign) + faire "to do" (from Latin facere "to make, do," from PIE root *dhe- "to set, put"). A French version of Medieval Latin foris factum; the notion perhaps is to "do too much, go beyond (what is right)." As an adjective from late 14c., from Old French forfait. Compare foreclose.
forfeit (v.)
mid-14c., " transgress, offend, misbehave;" late 14c., "to lose by misconduct," from forfeit (n.) or from Anglo-French forfet, Old French forfait, past participle of forfaire. Related: Forfeited; forfeits; forfeiting.
