1. An exclamation used to startle or frighten.
    • 1603, Michel de Montaigne, chapter 37, in John Florio, transl., The Essayes, […], book II, printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821 ↗:
      We may fairely cry bo-bo-boe; it may well make us hoarse, but it will nothing advaunce it.

bo (plural bos)

  1. (US, slang) Fellow, chap, boy.
    • 1940, Raymond Chandler, Farewell, My Lovely, Penguin 2010, p. 255:
      ‘Never heard of him,’ he smiled. ‘On your way, bo.’

bo (plural bos)

  1. (martial arts) A quarterstaff, especially in an oriental context.

Proper noun
  1. A male given name in occasional use since the 1970s.
Proper noun
  1. A city in Sierra Leone.


bo (uncountable)

  1. (informal, euphemism) Initialism of body odor
Proper noun
  1. (business, computing) Initialism of w:Business Objects a French enterprise software company specializing in business intelligence
  • (business) BOBJ

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