Definition of fill out phrasal verb from the Oxford Advanced American Dictionary

 

fill out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to become larger, rounder, or fatter

fill somethingout

 
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to complete a form, etc. by writing information on it to fill out an application form To order, fill out the coupon on p 54.
See the Oxford Advanced Learner's Dictionary entry: fill out