The difference between Bide one's time and Cool one's heels
When used as verbs, bide one's time means to wait, especially for a suitable opportunity, whereas cool one's heels means to wait, especially impatiently or restlessly.
check bellow for the other definitions of Bide one's time and Cool one's heels
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Bide one's time as a verb (intransitive, idiomatic):
To wait, especially for a suitable opportunity.
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Cool one's heels as a verb (idiomatic):
To wait, especially impatiently or restlessly.