Английский разговорный словарь (основной) - undulate
Undulate
undulate
ˈʌndjuleɪt v. & adj. --v. intr. & tr. have or cause to have a wavymotion or look. --adj. wavy, going alternately up and down or in and out (leaves with undulate margins). øøundulately adv. [LL undulatus f. L unda wave]