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

 

breakfast

 verb
verb
BrE BrE//ˈbrekfəst//
 
; NAmE NAmE//ˈbrekfəst//
 
Verb Forms present simple I / you / we / they breakfast
BrE BrE//ˈbrekfəst//
 
; NAmE NAmE//ˈbrekfəst//
 
he / she / it breakfasts
BrE BrE//ˈbrekfəsts//
 
; NAmE NAmE//ˈbrekfəsts//
 
past simple breakfasted
BrE BrE//ˈbrekfəstɪd//
 
; NAmE NAmE//ˈbrekfəstɪd//
 
past participle breakfasted
BrE BrE//ˈbrekfəstɪd//
 
; NAmE NAmE//ˈbrekfəstɪd//
 
-ing form breakfasting
BrE BrE//ˈbrekfəstɪŋ//
 
; NAmE NAmE//ˈbrekfəstɪŋ//
 
 
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[intransitive] breakfast (on something) (formal) to eat breakfast Many of the hotel’s guests had already breakfasted and departed. They breakfasted on coffee and hot rolls. Word Origin late Middle English: from the verb break + the verb fast.
See the Oxford Advanced American Dictionary entry: breakfast