Oxford Dictionary English

undulate

verb
verb
BrE BrE//ˈʌndjuleɪt//
; NAmE NAmE//ˈʌndʒəleɪt//
[intransitive] (formal)Verb Forms present simple I / you / we / they undulate
BrE BrE//ˈʌndjuleɪt//
; NAmE NAmE//ˈʌndʒəleɪt//
 he / she / it undulates
BrE BrE//ˈʌndjuleɪts//
; NAmE NAmE//ˈʌndʒəleɪts//
 past simple undulated
BrE BrE//ˈʌndjuleɪtɪd//
; NAmE NAmE//ˈʌndʒəleɪtɪd//
 past participle undulated
BrE BrE//ˈʌndjuleɪtɪd//
; NAmE NAmE//ˈʌndʒəleɪtɪd//
 -ing form undulating
BrE BrE//ˈʌndjuleɪtɪŋ//
; NAmE NAmE//ˈʌndʒəleɪtɪŋ//
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to go or move gently up and down like waves The countryside undulates pleasantly. Wordfinderlandscapebarren, fertile, landscape, lush, mountainous, rolling, rugged, undulate, volcanic, wooded Word Originmid 17th cent.: from late Latin undulatus, from Latin unda ‘a wave’.
See undulate in the Oxford Advanced American Dictionary
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