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

 

picnic

 verb
verb
BrE BrE//ˈpɪknɪk//
 
; NAmE NAmE//ˈpɪknɪk//
 
Verb Forms present simple I / you / we / they picnic
BrE BrE//ˈpɪknɪk//
 
; NAmE NAmE//ˈpɪknɪk//
 
he / she / it picnics
BrE BrE//ˈpɪknɪks//
 
; NAmE NAmE//ˈpɪknɪks//
 
past simple picnicked
BrE BrE//ˈpɪknɪkt//
 
; NAmE NAmE//ˈpɪknɪkt//
 
past participle picnicked
BrE BrE//ˈpɪknɪkt//
 
; NAmE NAmE//ˈpɪknɪkt//
 
-ing form picnicking
BrE BrE//ˈpɪknɪkɪŋ//
 
; NAmE NAmE//ˈpɪknɪkɪŋ//
 
 
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(picnicking, picnicked) [intransitive] to have a picnic No picnicking allowed (= on a sign) Word Origin mid 18th cent. (denoting a social event at which each guest contributes a share of the food): from French pique-nique, of unknown origin.
See the Oxford Advanced American Dictionary entry: picnic