sái-sim-hēng使心行

to exercise one's wits for personal gain

to exercise one's wits for personal gain; to pull a smart trick

English Wiktionary, “使心行” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E4%BD%BF%E5%BF%83%E8%A1%8C · confidence: Medium (Wiktionary)