Definition of frank verb from the Oxford Advanced Learner's Dictionary

 

frank

 verb
verb
BrE BrE//fræŋk//
 
; NAmE NAmE//fræŋk//
 
Verb Forms present simple I / you / we / they frank
BrE BrE//fræŋk//
 
; NAmE NAmE//fræŋk//
 
he / she / it franks
BrE BrE//fræŋks//
 
; NAmE NAmE//fræŋks//
 
past simple franked
BrE BrE//fræŋkt//
 
; NAmE NAmE//fræŋkt//
 
past participle franked
BrE BrE//fræŋkt//
 
; NAmE NAmE//fræŋkt//
 
-ing form franking
BrE BrE//ˈfræŋkɪŋ//
 
; NAmE NAmE//ˈfræŋkɪŋ//
 
 
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[often passive] frank something to stamp a mark on an envelope, etc. to show that the cost of posting it has been paid or does not need to be paid Word Originverb early 18th cent.: from the adjective frank, an early sense being ‘free of obligation’.
See the Oxford Advanced American Dictionary entry: frank