Definition of sub verb from the Oxford Advanced American Dictionary

     

    sub

     verb
    verb
    NAmE//sʌb//
     
    Verb Forms present simple I / you / we / they sub
     
    he / she / it subs
     
    past simple subbed
     
    -ing form subbing
     
     
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  1. 1[transitive] sub somebody to replace a sports player with another player during a game synonym substitute He was subbed after just five minutes because of a knee injury.
  2. 2[intransitive] sub (for somebody) to do someone else's job for them for a short time synonym substitute
  3. 3[transitive] sub something for something to use something instead of something else, especially instead of the thing you would normally use synonym substitute For a lower-calorie version of the recipe, try subbing milk for cream.
See the Oxford Advanced Learner's Dictionary entry: sub