We found 3 dictionaries that define the word be long in the tooth:

General (2 matching dictionaries)

1. be long in the tooth: Cambridge Advanced Learner's Dictionary
2. be long in the tooth: Dictionary.com

Miscellaneous (1 matching dictionary)

3. be long in the tooth: Idioms

▸ Words similar to be long in the tooth ▸ Usage examples for be long in the tooth ▸ Idioms related to be long in the tooth ▸ Wikipedia articles (New!) ▸ Words that often appear near be long in the tooth ▸ Rhymes of be long in the tooth ▸ Invented words related to be long in the tooth