We found one dictionary that defines the word four-character idiom:

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1. Four-character idiom: Wikipedia, the Free Encyclopedia

▸ Words similar to four-character idiom ▸ Usage examples for four-character idiom ▸ Idioms related to four-character idiom ▸ Wikipedia articles (New!) ▸ Words that often appear near four-character idiom ▸ Rhymes of four-character idiom ▸ Invented words related to four-character idiom