Definition of undulate verb from the Oxford Advanced American Dictionary

 

undulate

 verb
verb
NAmE//ˈʌndʒəˌleɪt//
 
[intransitive](formal)Verb Forms present simple I / you / we / they undulate
 
he / she / it undulates
 
past simple undulated
 
-ing form undulating
 
 
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to go or move gently up and down like waves The tall grasses undulated in the breeze.
See the Oxford Advanced Learner's Dictionary entry: undulate