Present participle of champ; the act of biting or chewing noisily, often used to describe horses biting their bits.
From 'champ' plus the present participle suffix '-ing,' forming the continuous form of the verb describing ongoing chewing action.
The image 'champing at the bit' became such a popular idiom that most people don't even realize it comes from watching impatient horses literally chewing on their bits—it's a vivid metaphor born from real animal behavior!
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