Definition of moisten verb from the Oxford Advanced American Dictionary

 

moisten

 verb
verb
NAmE//ˈmɔɪsn//
 
[transitive, intransitive]moisten (something)Verb Forms present simple I / you / we / they moisten
 
he / she / it moistens
 
past simple moistened
 
-ing form moistening
 
 
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to become or make something slightly wet He moistened his lips before he spoke.
See the Oxford Advanced Learner's Dictionary entry: moisten