The idiom "long in the tooth" means that someone is getting old. The spelling of this phrase reflects its origin in horse anatomy. Horses' teeth continue to grow throughout their lives and their age can be estimated by the length of their teeth. In IPA phonetic transcription, "long in the tooth" would be spelled /lɔŋ ɪn ðə tuθ/. The /ŋ/ sound represents the "ng" in "long", while the /ð/ sound is the voiced "th" in "tooth".
The phrase "long in the tooth" is an idiomatic expression used to describe an individual, typically older in age, whose physical appearance or behavior shows signs of aging or wear. It is generally associated with people, but can also be used to refer to animals or objects. The term's origin can be traced back to the practice of determining a horse's age by examining the length of its teeth, as they grow longer and more noticeable with time.
Figuratively, being "long in the tooth" implies that one is past their prime, exhibiting traits such as wrinkles, gray hair, or a more subdued demeanor. It suggests that the person or thing in question has been around for a significant period and may be perceived as outdated or lacking vitality. It can also imply a lack of adaptability or resistance to change. While the phrase is often used in a lighthearted manner, it can carry a subtle undertone of ageism or dismissiveness.
Despite its association with aging, the expression is not limited to physical appearance alone. It can also refer to someone who appears worn-out, experienced, or excessively wise due to the accumulation of life experiences. Therefore, "long in the tooth" serves as a vivid metaphor conveying the idea of the passage of time and its effects on an individual's appearance or demeanor.