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English definition of “keep sth up”

keep sth up

phrasal verb with keep     /kiːp/ verb (kept, kept)
B1 to make something continue at its present level and not allow it to fall: You must eat to keep your strength up.Preserving and savingDefending and protecting
(Definition of keep sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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