Senses
以石投水 to get along well
To be in complete agreement or harmony; to hit it off; to be perfectly compatible with each other like a stone thrown into water
以石投水 to test the water
To test the water or check the reaction of others before taking action.
以石投水 to be natural
To describe a person of high character or talent whose actions and words naturally align with the Way (Tao) like a stone sinking effortlessly into water