Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Probably from goff 'stupid person' (16-20 centuries), from French goffe 'awkward, stupid'

goof

2 noun
     
goof2 [countable] informal especially American English
1 also goof up a silly mistake:
The goof could cost the city $5 million.
2 also goofball someone who is silly
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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