to fill something with air using a pump
to make someone feel excited and enthusiastic
to make something increase by a large amount
My bicycle tyres need pumping up.
The President, sensing the urgency of Yeltsin's decline, called upon the major industrialized nations to pump up emergency aid for Yeltsin.
The coach’s job is to get everyone pumped up for the game.
They have cut prices in an attempt to pump up sales.
pumps up
pumping up
pumped up
There is no origin for this phrasal verb
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