Definition of fast verb from the Oxford Advanced American Dictionary

 

fast

 verb
verb
NAmE//fæst//
 
[intransitive]Verb Forms present simple I / you / we / they fast
 
he / she / it fasts
 
past simple fasted
 
-ing form fasting
 
 
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to eat little or no food for a period of time, especially for religious or health reasons Muslims fast during Ramadan.
See the Oxford Advanced Learner's Dictionary entry: fast