'Yā yùn' literally means 'press rhythm'—'yā' (to press, to enforce) and 'yùn' (rhyme, rhyme scheme). Together, they form a verb meaning 'to rhyme', referring to the poetic or linguistic practice of arranging words so their ending sounds match, especially in poetry, song lyrics, or playful speech. It emphasizes intentional sound patterning, not accidental similarity.

This term is commonly used when discussing classical and modern Chinese poetry, rap, children’s rhymes, and even advertising slogans where rhythmic appeal matters. Unlike English 'rhyme', which can be both noun and verb, 'yā yùn' functions almost exclusively as a verb in modern usage (e.g., '这首诗押韵了' — 'This poem rhymes'). It’s rarely used as a noun; for the noun 'rhyme', speakers typically use 'yùn' alone or 'yùnjiǎo' (rhyming syllable).