Definition of "undulating" []

• Moving up and down like waves; wavy (adjective)
• Forming a series of regular curves (adjective)
• Present participle of undulate. (verb)

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• "Smoke seemed to be pouring off the hills, as the winds of mid-May carried the plumes of smoke downward in undulating sheets, in the general direction of the airport."
• "Two flags were stiffly undulating from the halyards like squares of flexible sheet-iron."
• "And with a significant hitch of his lean shoulders which set in undulating motion every fold of the old-fashioned cloak he wore, he started again for the door."