the choice of taking either that which is offered or nothing; the absence of a real alternative.
Origin: 1640–50; after Thomas Hobson (1544–1631), of Cambridge, England, who rented horses and gave his customer only one choice, that of the horse nearest the stable door
Eng. university slang, supposedly from Thomas Hobson (c.1544-1631), Cambridge stable manager who let horses and gave customers a choice of the horse next in line or none at all. Phrase popularized by Milton, c.1660.