skim

travel on the surface of water

move or pass swiftly and lightly over the surface of

examine hastily

She scanned the newspaper headlines while waiting for the taxi

cause to skip over a surface

Skip a stone across the pond

coat (a liquid) with a layer

used of milk and milk products from which the cream has been removed

yogurt made with skim milk

a thin layer covering the surface of a liquid

there was a thin skim of oil on the water