up - definition and synonyms

verb [transitive] informal 

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present tense
present participleupping
past tenseupped
past participleupped
  1. to increase an amount, or to raise something to a higher level

    They’ve upped taxi fares because of the rise in fuel prices.

    up the ante (=raise the level of what is expected, offered, or risked in a situation):

    Protesters have upped the ante by demanding that Wright resign.