Pump
A pump is an informal game term, used as both a noun and a verb. A pump is a card played to temporarily increase a character's strength. Generally, pumps are played during the Skirmish Phase, after assignments have been made. Most pumps are events like Flurry of Blows (2C5) s. Some characters, like Gimli, Son of Gloin (1R13) can pump themselves, and some other card types, like Saruman's Ambition (1C133) , can be discarded to pump characters.
Cards that grant a continuous bonus, like Dwarven Axe (1C9) , are generally not considered pumps. Cards like Enraged (6R26) that grant a temporary strength bonus that starts before the Assignment Phase are sometimes called pumps and sometimes not, but they're so rare that they're not often referred to at all.