"large, voracious fish," by 1560s, perhaps mid-15c., if an isolated instance in a diary quoted in Middle English Compendium is the same word, of uncertain origin. The meaning "dishonest person who preys on others," though attested from 1599 (sharker "artful swindler" in this sens abyss...
allegro, for example, literally means “cheerfully.” Some of the terms have retained a meaning of this sort, for example, largo, “broadly.” These terms are also used with modifiers that strengthen or weaken the meaning, for example,molto, “very,” andma non tropo, “but not overly.”...