Толковый словарь английского языка Oxford English Reference - lightly

adv. in a light (esp. frivolous or unserious) manner. Phrases and idioms get off lightly escape with little or no punishment. take lightly not be serious about (a thing). LIGHTNING n. & adj. --n. a flash of bright light produced by an electric discharge between clouds or between clouds and the ground. --attrib.adj. very quick (with lightning speed). Phrases and idioms lightning-conductor (or -rod) a metal rod or wire fixed to an exposed part of a building or to a mast to divert lightning into the earth or sea. lightning strike a strike by workers at short notice, esp. without official union backing. Etymology: ME, differentiated from lightening, verbal noun f. LIGHTEN(2)