Something that provides energy or vigor; commonly refers to the battery brand known for its advertising mascot.
From 'energy' (Greek 'energeia', meaning 'activity') plus suffix '-izer' indicating an agent. The brand name was created in 1959, becoming famous through the Energizer Bunny campaign.
The Energizer Bunny, introduced in 1989, was actually a parody of a similar Duracell campaign, but became so iconic that many people forgot it started as advertising satire—a perfect example of how commercial symbols can transcend their original context.
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