持子之手拿去喂狗
[chí zi zhī shŏu ná qù wèi gŏu]
Literally, it translates as 'Holding your hand to feed the dog'. Idiomatically, it expresses that the person has received a promise or declaration of love from someone but now finds this sentiment worthless. Hence, the expression conveys disappointment or even a sarcastic attitude towards unfulfilled promises in romantic settings.