cool one's heels

見 heel

keep (或 lose) one's cool

(informal)maintain (or fail to maintain) a calm and controlled attitude

(非正式)保持（或失去）冷靜

cool it&I{【俚語】}

To calm down; relax.

冷靜下來；輕松

cool (one's) heels【非正式用語】

To wait or be kept waiting.

等著或別人讓等著