Definition of four number from the Oxford Advanced Learner's Dictionary

      

    four

     
    BrE BrE//fɔː(r)//
     
    ; NAmE NAmE//fɔːr//
     
    Cricket, Boating
     
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  1. 1  number 4 There are examples of how to use numbers at the entry for five.
  2. 2noun a group of four people or things to make up a four at tennis a coach and four (= four horses)
  3. 3noun (in cricket) a shot that scores four runs See related entries: Cricket
  4. 4noun a team of four people who row1 a long narrow boat in races; the boat that they row1 See related entries: Boating
  5. Idioms (of a person) bent over with hands and knees on the ground We were crawling around on all fours. used when you are talking about keeping something secret Don't let this go further than these four walls (= Don't tell anyone else who is not in the room now).