the returns from an activity or undertaking do not warrant the time, money or effort required—calque of French ‘le jeu ne vaut pas la chandelle’—1603, in John Florio’s translation of Montaigne’s Essays
UK, 1884—‘what a surprise!’—a borrowing from French—chiefly used ironically, to imply that a situation or event is unsurprising, typical or predictable
USA, 1936—characteristic or reminiscent of the Left Bank (‘Rive Gauche’ in French), the part of Paris south of the River Seine, noted for its intellectual and artistic life
French, 1848; English, 1861—a small, oblong cake made of choux pastry, filled with cream, and typically topped with chocolate icing—literally ‘lightning’—origin unknown
Voltaire revived the use of ‘désappointer’ in the sense ‘to frustrate the expectation or desire of (a person)’ with reference to this use of the English verb ‘disappoint’.
UK, 1935—jocular—is used by a man to defer his sexual duties to a wife or lover; is also applied to any postponement—translation of the earlier phrase ‘not tonight, Josephine’
USA, 1882—the fourteenth of July, the national holiday of the French republic, commemorating the storming of the Bastille on 14th July 1789—also shortened to ‘Quatorze’ (1898)