Wiktionary
vb. (present participle of pump up English)
Usage examples of "pumping up".
Bill got a little downhill stretch and began to pedal faster, his legs pumping up and down as he stood forward over the bike's fork.
Nadia led him into the refuge lock by hand, as if she understood this, and when the lock was closed and pumping up Nirgal began to understand the voices on the common band: “.
We had to have another, and once again they let us hold each other, and the nozzles went in and the water was pumping up into me, and one of the grooms whipped my cock a little with the thong as the purge continued.
We spent the better part of an hour pumping up the pressure in Rodriguez's suit until it started to balloon.
But to Madeline Sime remained the doormat: good for filling an evening on short notice, and for pumping up her ego when it lost pressure.
Snail was grinning, holding one fist with the other and pumping up his arm muscles.
His nostrils were dark and fiery as he labored around me, pumping up the chair and stropping his razor.