Pronunciation: [kˈuːlz hˈiːlz] (IPA) 
The phrase "cools heels" means to wait patiently or remain inactive. The correct spelling of this phrase is "cool one's heels," with the "one's" often being omitted in casual conversation. The IPA phonetic transcription for this phrase is /kʊl wʌnz hɪlz/. The vowel sound in "cool" is pronounced as "oo" as in "pool," while the "w" sound is pronounced as "w." The final "z" in "heels" is pronounced as "z" as in "buzz."
To "cool one's heels" is an idiomatic expression used to describe the act of waiting patiently, often used when one is made to remain in a place or situation until further notice or the arrival of someone or something. This phrase is commonly used in informal contexts and may carry a slightly humorous or lighthearted undertone.
The phrase is believed to have originated from the feeling of anticipation or restlessness one experiences while waiting, which may cause their feet to grow hot or uncomfortable. In this sense, "cooling one's heels" suggests a need to calm down or relax in order to pass the time more comfortably.
This expression typically implies a sense of temporary inconvenience and often conveys a slight sense of annoyance or frustration. It can be used to express someone's impatience or eagerness to proceed with a certain activity or event. For instance, if a person is asked to "cool their heels" at a doctor's office, it means they must wait patiently until their turn for the appointment.
Overall, the phrase "cool one's heels" emphasizes the need for patience and calmness while waiting for something or someone. It signifies the ability to manage time and expectations effectively without becoming irritated or restless, acknowledging the temporary nature of the situation.
The phrase "cools heels" has its origin in the late 19th century and is derived from a combination of two separate idioms.
The first idiom, "heel", dates back to the 14th century and originally referred to the back part of the foot. It eventually developed a figurative meaning relating to waiting or staying in a certain place, often in a state of readiness. This sense of "heel" as waiting or standing by has influenced various phrases, including "arrest one's heels" and "to cool one's heels".
The second idiom, "cool one's heels", emerged in the 19th century and had the literal meaning of reducing the heat of one's feet by pausing or resting. It has been suggested that this idiom can be traced back to the practice of cooling down or tempering hot "heels" (iron horseshoes) by placing them in water.
