Longman Dictionary of Contemporary English homepage

up

3 verb
     
up3 past tense and past participle upped, present participle upping [transitive]
1 to increase the amount or level of something:
They've upped their offer by 5%.
2

up and do something

to suddenly do something different or surprising:
Without saying another word, he upped and left.

➔ up the ante

at ante1

➔ up sticks

at stick2 (11)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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