noun
a gathering or party specifically for the groom and his male friends before a wedding
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The groom-to-be's friends organized a stag do to celebrate his upcoming wedding.
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We're planning a stag do for John next weekend, it's going to be epic!
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Let's make sure the stag do is a night to remember!
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The stag do symbolizes the end of bachelorhood and the start of a new chapter in life.