Big

Concise Oxford English Dictionary © 2008 Oxford University Press:
big/bɪɡ/

▶adjective (bigger, biggest)

• 1 of considerable size, power, or extent.

  ■ larger than others of the same kind.

  ■ informal exciting great interest or popularity.

• 2 of considerable importance or seriousness.

• 3 informal, often ironic generous.

▶verb (big someone/thing up) black slang praise or recommend someone or something highly.

– phrases
the Big Apple informal New York City.
big money (chiefly N. Amer. also big bucks) informal large amounts of money.
the big screen informal the cinema.
big tent a political party's policy of permitting and encouraging a broad spectrum of views among its members. [as modifier] a big-tent campaign.
big with child archaic advanced in pregnancy.
give someone the big E Brit. informal reject someone. [E from elbow.]
talk big informal talk confidently or boastfully.
think big informal be ambitious.
too big for one's boots informal conceited.

– derivatives
biggish adjective,
bigness noun.

– origin ME: of unknown origin.