Meaning: This sentence is describing the action of clouds floating high in the sky.
Choice of Words: "Clouds" are visible masses of water droplets or ice crystals suspended in the atmosphere. "Float" means to move or rest on the surface of a liquid or gas without sinking. "High" means to be at a great distance from the ground. "Sky" is the space above the earth and below the clouds. Together, "Clouds float high sky" describes the action of clouds moving or resting on the surface of the atmosphere at a great distance from the ground.