up - definition and synonyms

verb [transitive] informal 

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/ʌp/
present tense
I/you/we/theyup
he/she/itups
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.