Definition of "ruing" [ruing]

• Present participle of rue. (verb)

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• "LIMA, Peru—Ollanta Humala, a left-leaning former military officer, and Keiko Fujimori, daughter of an imprisoned ex-president, appeared headed for a runoff election that will leave many investors in this booming economy ruing the options, after the two emerged as the top vote-getters in the first round presidential balloting Sunday."
• "*** Americas Peruvian electoral officials confirmed that Ollanta Humala, a left-leaning former military officer, and Keiko Fujimori, daughter of an imprisoned ex-president, are headed for a presidential runoff election in June that will leave many investors in this booming economy ruing the options."
• "But that cheery prospect may not have distracted the advertising and marketing executives in the room from ruing the hundreds of billions of dollars they've apparently thrown down the rat hole these past 35 years."