D defs.my
Entry 4 senses Webster, 1913

Indorse

· In·dorse · IPA
01 v. t. To cover the back of; to load or burden.
imp. & p. p. Indorsed; p. pr. & vb. n. Indorsing
  1. 1.
    To cover the back of; to load or burden.[Obs.]
    “Elephants indorsed with towers.” Milton.
  2. 2.
    To write upon the back or outside of a paper or letter, as a direction, heading, memorandum, or address.
  3. 3.
    To write one's name, alone or with other words, upon the back of (a paper), for the purpose of transferring it, or to secure the payment of a note, draft, or the like; to guarantee the payment, fulfillment, performance, or validity of, or to certify something upon the back of (a check, draft, writ, warrant of arrest, etc.).(Law & Com.)
  4. 4.
    To give one's name or support to; to sanction; to aid by approval; to approve; as, to indorse an opinion.
Phrases & compounds
To indorse in blank — to write one's name on the back of a note or bill, leaving a blank to be filled by the holder.