1622. Bacon, Nat. Hist. [Enc. Dict.]. Mushrooms come up in a night,
and yet they are unsown; and therefore such as are upstarts in
state, they call in reproach mushrooms.
1811. Lex. Bal., s.v. Mushroom. A person or family suddenly raised
to riches and eminence: an allusion to that fungus which starts up
in a night.
1859. Matsell, Vocabulum, s.v.
Music, subs. (American).—1. Fun; frolic.