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
pump up
Turkish pronunciation
pʌmp ʌp
Pronunciation
/ˈpəmp ˈəp/ /ˈpʌmp ˈʌp/
Etymology
[ 'p&mp ] (noun.) 15th century. Middle English pumpe, pompe, from Middle Low German pumpe or Middle Dutch pompe, perhaps from Spanish bomba, of imitative origin.