champ at the bit

champ at the bit idiom
Show impatience at being held back or delayed, as in The dismissal bell hadn't rung, but they were champing at the bit to leave. This term transfers the action of a horse that impatiently bites the bit in its mouth to human behavior. [Mid-1600s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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