Looking for a slogan, spitting, followed by a four-character idiom that rhymes

Spit saliva into beads

pēn tuò chéng zhū

Explanation: saliva. The spittle he coughed turned into pearls. Describes being knowledgeable and capable

From "Zhuangzi Qiu Shui" written by Zhuang Zhou in the Warring States Period and Song Dynasty: "What is the son who doesn't see his husband's spit? When sprayed, the big ones will be like beads, and the small ones will be like mist."

Structural subject-predicate idioms

Used as predicates and objects; metaphors for extraordinary speech or beautiful poetry

Synonyms: coughing up saliva