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English definition of “keep sth up”

keep sth up

phrasal verb with keep     /kiːp/ verb (past tense and past participle kept)
B1 to not allow something that is at a high level to fall to a lower level: Make sure you eat properly - you've got to keep your strength up.Effort and expending energyTrying and making an effort
(Definition of keep sth up from the Cambridge Learner's Dictionary © Cambridge University Press)

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