Bedeutung von “keep sth up” — Learner’s Dictionary

keep sth up

phrasal verb with keep us uk /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.

(Definition von “keep sth up phrasal verb, verb” aus dem Cambridge Learner's Dictionary © Cambridge University Press)