Longman Dictionary of Contemporary English homepage

do

3 noun
     
do3 plural dos or do's [countable]
1DL informal a party or other social event:
We're having a do to celebrate his 30th birthday.
2

dos and don'ts

also do's and don'ts things that you should and should not do in a particular situation:
The booklet lists the dos and don'ts of caring for dogs.
3 American English informal a hairdo
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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