The Collaborative International Dictionary of English v.0.48:

Odds \Odds\ ([o^]dz), n. sing. & pl. [See Odd, a.]
   1. Difference in favor of one and against another; excess of
      one of two things or numbers over the other; inequality;
      advantage; superiority; hence, excess of chances;
      probability. The odds are often expressed by a ratio; as,
      the odds are three to one that he will win, i. e. he will
      win three times out of four "Preeminent by so much odds."
      --Milton. "The fearful odds of that unequal fray."
      --Trench.
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            The odds
            Is that we scarce are men and you are gods. --Shak.
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            There appeared, at least, four to one odds against
            them.                                 --Swift.
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            All the odds between them has been the different
            scope . . . given to their understandings to range
            in.                                   --Locke.
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            Judging is balancing an account and determining on
            which side the odds lie.              --Locke.
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   2. Quarrel; dispute; debate; strife; -- chiefly in the phrase
      at odds.
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            Set them into confounding odds.       --Shak.
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            I can not speak
            Any beginning to this peevish odds.   --Shak.
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   At odds, in dispute; at variance. "These squires at odds
      did fall." --Spenser. "He flashes into one gross crime or
      other, that sets us all at odds." --Shak.

   It is odds, it is probable; same as odds are, but no
      longer used. [Obs.] --Jer. Taylor.

   odds are it is probable; as, odds are he will win the gold
      medal.

   Odds and ends, that which is left; remnants; fragments;
      refuse; scraps; miscellaneous articles. "My brain is
      filled . . . with all kinds of odds and ends." --W.
      Irving.

   slim odds low odds; poor chances; as, there are slim odds
      he will win any medal.
      [1913 Webster +PJC]