American Dictionary of the English Language

INDORSE, verb transitive indors'. [Latin in and dorsum, the back.]

1. To write on the back of a paper or written instrument; as, to indorse a note or bill of exchange; to indorse a receipt or assignment on a bill or note. Hence,

2. To assign by writing an order on the back of a note or bill; to assign or transfer by indorsement. The bill was indorsed to the bank.

To indorse in blank, to write a name only on a note or bill, leaving a blank to be filled by the indorsee.