Contents of some dictionaries (6)

I believe the answer is:

idioms

(Other definitions for idioms that I've seen before include "Sayings with meanings not obvious from the words" , "Characteristic styles of expression, language or art" , "Sayings as of a people or group" , "Modes of expression peculiar to a language" , "Dialectic words" .)

I've seen this clue in The New York Times.

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