Here are some ways to understand the term:
* Extensive knowledge: A walking dictionary possesses a wide range of vocabulary, covering various subjects and contexts.
* Fluency and accuracy: They can use words correctly and appropriately in their speech and writing.
* Quick recall: They have a good memory for words and can readily access them when needed.
The expression is often used to praise someone's linguistic abilities and their knowledge of language.
It's important to note that "walking dictionary" is an informal term and might not always be the most accurate description. While someone with a large vocabulary might be considered a walking dictionary, it doesn't necessarily mean they understand the nuances and implications of every word they know.