Word Study
    i.o.u
CIDE DICTIONARY
i.o.u,  [phonetic, from  I owe you.]. 
                                            
                                         A paper having on it these letters, with a sum named, and duly signed; -- in use in England as an acknowledgment of a debt, and taken as evidence thereof, but not amounting to a promissory note; a due bill.                                         Wharton.  Story.                                          [1913 Webster]                                                                                                                    
                                                                                    
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