big up

/B IH1 G AH0 P/
verb
  1. 1

    (slang, transitive) To proclaim or exaggerate the importance of; to promote.

  2. 2

    (slang, transitive) To behave confidently and proudly.

  3. 3

    (transitive, informal) To increase one's muscle mass.

  4. 4

    (informal) To become big.

noun
  1. 1

    (slang, also big ups) Significant respect or acclaim.