Pronunciation: [ˌɒn kˈʌf] (IPA) 
The phrase "on cuff" means buying something on credit or without paying immediately. The spelling of "on cuff" can be explained using IPA phonetic transcription as /ɒn kʌf/. The "on" is pronounced as /ɒn/ with a short o sound. The "cuff" is pronounced as /kʌf/ with a strong k sound and a short u sound. Overall, the phrase "on cuff" is commonly used in informal settings and is not recommended for formal situations.
The expression "on cuff" refers to a situation where payment is made later or promised without immediate payment. The term "cuff" originally emerged in the 16th century and it meant the hem or edge of a garment, especially a sleeve. It later acquired the extended meaning of "enclosure" or "attachment".
In the 19th century, the phrase "on cuff" started to be used in a figurative sense, relating to the practice of keeping track of debts or purchases by writing them on the cuff of one's sleeve. This was a common occurrence when people didn't have a means of immediate payment, but could write a commitment to pay in the future.
Over time, the phrase "on cuff" evolved to refer to any situation where something is provided or received without upfront payment, with the understanding that payment will be made later.
