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Related to dictionary: thesaurus
have swallowed a dictionary
To be apt to incorporate long, difficult words into one's speech. That guy sounds like he's swallowed a dictionary—none of the kids can follow what he's saying.
a walking dictionaryor
a walking encyclopedia
If you describe someone as a walking dictionary or a walking encyclopedia, you mean that they know a lot of words or facts. She raised five of us on her own and she's a walking dictionary. He was a walking encyclopedia of music, full of wit and charm. Note: People sometimes use other words instead of dictionary or encyclopedia. He's a walking database on anything relating to insurance.
have swallowed a dictionaryuse long and obscure words when speaking. informal
a walking ˈdictionary, encycloˈpedia, etc.(informal) used to describe a human or living example of the thing mentioned: Geoff is a walking encyclopedia. He knows about everything. ♢ She’s a walking dictionary (= she knows a lot of words).
See also: walking
swallow the dictionary
tv. to acquire an enormous vocabulary. (Usually in the past tense.) My uncle says I’ve swallowed the dictionary. That’s because I know so many big words.