Definitions of pump up:
- verb: (transitive) To inflate by means of a pump.
- verb: (transitive) To inflate with a pumping action.
- verb: (transitive, figuratively) To excite a person or group to a frenzy.
- verb: (intransitive, bodybuilding) To cause one's muscles to swell by means of focussed weightlifting.
(Definitions from Wiktionary)
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