contrad. An indorsement which does not mention the name of the person in whose favor it is made; it is usually made by writing the name of the indorser on the back of the bill. 2. When a bill or note has been indorsed in blank, its negotiability cannot afterwards be restrained. As many persons as agree may join in suing on a bill when indorsed in blank; for although it was given to one alone, yet by allowing the others to join in the suit, he has ‘Made them sharers in his rights.