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

 

lunch

 verb
verb
BrE BrE//lʌntʃ//
 
; NAmE NAmE//lʌntʃ//
 
Verb Forms present simple I / you / we / they lunch
BrE BrE//lʌntʃ//
 
; NAmE NAmE//lʌntʃ//
 
he / she / it lunches
BrE BrE//ˈlʌntʃɪz//
 
; NAmE NAmE//ˈlʌntʃɪz//
 
past simple lunched
BrE BrE//lʌntʃt//
 
; NAmE NAmE//lʌntʃt//
 
past participle lunched
BrE BrE//lʌntʃt//
 
; NAmE NAmE//lʌntʃt//
 
-ing form lunching
BrE BrE//ˈlʌntʃɪŋ//
 
; NAmE NAmE//ˈlʌntʃɪŋ//
 
Dining out
 
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[intransitive] (formal) to have lunch, especially at a restaurant He lunched with a client at the Ritz. See related entries: Dining out Word Origin early 19th cent.: abbreviation of luncheon.
See the Oxford Advanced American Dictionary entry: lunch