stag

go stag

to go to an event (which is meant for couples) without a member of the opposite sex. (Originally referred only to males.) Is Tom going to take you, or are you going stag? Bob didn't want to go stag, so he took his sister to the party.

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a stag night/party

a party for a man who is going to get married, to which only his male friends are invited On Keith's stag night, his friends left him tied to a lamp-post in Trafalgar Square, wearing only his underpants.

See also: night

go stag  (American)

if a man goes stag to a social event, he goes without a woman He usually prefers to go stag to parties.