If you pump up something such as a tyre, you fill it with air using a pump.
I tried to pump up my back tyre.
PHRASAL VERB : V P n (not pron) , also V n P
If you pump up something such as a tyre, you fill it with air using a pump.
I tried to pump up my back tyre.
PHRASAL VERB : V P n (not pron) , also V n P
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006