From Longman Dictionary of Contemporary Englishundulateun‧du‧late /ˈʌndjəleɪt $ -dʒə-/ verb [intransitive] formalCFMOVE/CHANGE POSITION to move or be shaped like waves that are rising and falling undulating hills —undulation /ˌʌndjəˈleɪʃən $ -dʒə-/ noun [countable, uncountable]→ See Verb table
Examples from the Corpus
undulate• It differs from the similar E. macrophyllus in its smaller, more rounded leaves and the leaf margins not being undulate.• The grass rolled in waves, glistening and gleaming as it undulated.• I saw various ridges to my right and left, undulating over the huge and imposing landscape that now was exposed.• The run culminated in open, undulating slopes towards the Mer de Glace.• But though Rechtauk had disappeared and the forest been hewn down, the land was still soft and undulating, still green.• By undulating this, it drives itself forwards - or, with equal ease, backwards.• Joey Meeson watched as Lizzy danced, her body undulating to the thumping rhythm of the acid house music.• As the land undulated, waterfalls appeared and disappeared. 