To weep or mourn excessively. This hyperbole— how could weeping actually cause eyes to fall out?—dates back at least to the early eighteenth century. It appears in Colley Cibber’s 1705 play, The Careless Husband (1.1), “I could cry my eyes out,” and also in Jonathan Swift’s Polite Conversation (1738). In the nineteenth century it was sometimes altered to crying one’s heart out, especially in popular romantic novels such as Margaret Oliphant’s Joyce (1888).