cool one's heels
cool one's heels {v. phr.}, {slang}
To be kept waiting by another's pride or rudeness; be forced to wait by someone in power or authority; wait.
He cooled his heels for an hour in another room before the great man would see him.
I was left to cool my heels outside while the others went into the office.
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Source: A Dictionary of American Idioms
