Frenchman's acre noun an arpent or since the 1970s, a hectare, French measures of land CANADA
Like the “jag,” this unit of measure is said to be “bigger when they buy, smaller when they sell.” The suspicion [of English people] arises from the confusion created by the use of French terms and measures. An arpent is 0.84 of an acre. — Lewis Poteet, TalkingCountry, pp. 40–41, 1992