Noun
green goose (plural green geese)
- A young goose, especially under four years old. [from 15th c.]
c. 1595–1596 (date written), William Shakespeare, “Loues Labour’s Lost”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene i]:The Spring is neare when greene geese are a breeding.
1793 April 4, Hester Piozzi, Thraliana:My green Goose for this last Entertainment cost but 15s.
- (now rare) A fool, a simpleton. [from 18th c.]