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English definition of “keep sth up”

keep sth up

verb uk phrasal verb with keep   /kiːp/ (kept, kept) us  
B1 to make something continue at its present level and not allow it to fall: You must eat to keep your strength up.
(Definition of keep sth up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of keep sth up?
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