Definition of up verb from the Oxford Advanced American Dictionary

     

    up

     verb
    verb
    NAmE//ʌp//
     
    Verb Forms present simple I / you / we / they up
     
    he / she / it ups
     
    past simple upped
     
    -ing form upping
     
     
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  1. 1 [intransitive] up and… (informal or humorous) to suddenly move or do something unexpected He up and left without telling anyone.
  2. 2 [transitive] up something to increase the price or amount of something synonym raise The buyers upped their offer by $1,000.
  3. Idioms
    raise/up the ante
     
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    to increase the level of something, especially demands or sums of money His ex-wife has upped the ante in her alimony suit against him.
See the Oxford Advanced Learner's Dictionary entry: up