朝三暮四 (zhāo sān mù sì): lit. say three in the morning but four in the evening ; to change sth that is already settled upon; indecisive; to blow hot and cold

zhāosān

lit. say three in the morning but four in the evening ; to change sth that is already settled upon; indecisive; to blow hot and cold

The keeper offered his monkeys three nuts at dawn and four at dusk; they raged, so he said four then three, and they were delighted. Now mostly used for fickleness.