1 (wiktionary) 2 (zh.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.

HSK 2.0 (2010)	Big5	Gb	Pin	Eng
5		成语	cheng2 yu3	Chinese set expression; often made up of 4 characters or two couplets of 4 characters each; often alluding to a story or historical quotation/ idiom/ proverb/ saying/ adage/ set expression/ CL:條\|条[tiao2];本[ben3];句[ju4]
6		对联	dui4 lian2	rhyming couplet/ pair of lines of verse written vertically down the sides of a doorway/ CL:幅[fu2]