Longman Dictionary of Contemporary English homepage

goof

1 verb
     
goof1 also goof up [intransitive and transitive] informal
especially American English to make a silly mistake:
Somebody goofed and entered the wrong amount.
The restaurant totally goofed up our reservations.

goof around

phrasal verb
to spend time doing silly things or not doing very much [= mess about British English]
We spent the afternoon just goofing around on our bikes.

goof off

phrasal verb
to waste time or avoid doing any work:
He's been goofing off at school.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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