Pronunciation: [tˈe͡ɪl ˈɒf] (IPA) 
The phrase "tail off" is commonly used to describe a slow or gradual decrease in something, such as volume or intensity. The spelling of this phrase, however, may be confusing due to the silent letter "l" in "tail." In phonetic transcription, the word is spelled /teɪl ɒf/, where the "a" in "tail" is pronounced like the "ai" in "rain," and the "f" in "off" is pronounced like "uhf" with a slight emphasis on the "f."
The phrase "tail off" is an idiomatic expression that is commonly used to describe a gradual decrease or decline in quantity, intensity, or quality of something. It is typically used to imply that the pace or level of an activity or phenomenon starts to diminish or dwindle gradually until it eventually comes to an end. This phrase derives from the image of a tail, which tapers off towards its end.
In a literal sense, "tail off" refers to the tail of an animal or an object that becomes gradually thinner or smaller toward its extremity. However, when used figuratively, it describes a similar pattern of gradual decrease or diminishing.
For instance, in the context of a conversation, "tail off" can convey the idea of gradually talking less or losing enthusiasm. In the context of sales, it can be used to indicate a decline in sales figures over a period of time. Similarly, it can describe a fading interest or a decreasing level of intensity in a particular activity or event.
Overall, "tail off" serves as a versatile expression that encompasses a wide range of situations where a gradual decline or reduction occurs. It is often utilized to convey the idea of something gradually fading away or coming to an end, either in terms of quantity, intensity, or quality.
The etymology of the phrase "tail off" is derived from the literal meaning of the word "tail". In this context, "tail" refers to the appendage that extends from the rear end of an animal, usually long and flexible. The word "off" simply means to move away or decrease from a particular point or state.
When something "tails off", it means that it gradually decreases or diminishes, similar to the way a tail thins out as it extends further away from the body. The phrase is often used metaphorically to describe a gradual decrease or decline in something, such as a decline in business, a fading sound, or diminishing interest.
