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

 

fast

 verb
verb
BrE BrE//fɑːst//
 
; NAmE NAmE//fæst//
 
Verb Forms present simple I / you / we / they fast
BrE BrE//fɑːst//
 
; NAmE NAmE//fæst//
 
he / she / it fasts
BrE BrE//fɑːsts//
 
; NAmE NAmE//fæsts//
 
past simple fasted
BrE BrE//ˈfɑːstɪd//
 
; NAmE NAmE//ˈfæstɪd//
 
past participle fasted
BrE BrE//ˈfɑːstɪd//
 
; NAmE NAmE//ˈfæstɪd//
 
-ing form fasting
BrE BrE//ˈfɑːstɪŋ//
 
; NAmE NAmE//ˈfæstɪŋ//
 
Hunger
 
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[intransitive] to eat little or no food for a period of time, especially for religious or health reasons Muslims fast during Ramadan. During Ramadan they fast from dawn to sunset. See related entries: Hunger Word Originverb Old English fæstan (verb), of Germanic origin; related to Dutch vasten and German fasten, also to Old Norse fasta, the source of the noun.
See the Oxford Advanced American Dictionary entry: fast