Stag

noun
1.
an adult male deer.
2.
the male of various other animals.
3.
a man who attends a social gathering unaccompanied by a woman.
4.
Informal. stag party.
5.
a swine or bull castrated after maturation of the sex organs.
6.
British. a speculator who buys securities of a new issue in the hope of selling them quickly at a higher price.
verb (used without object), stagged, stagging.
7.
Informal. (of a man) to attend a social function without a female companion.
adjective
8.
of or for men only:
a stag dinner.
9.
intended for male audiences and usually pornographic in content:
a stag show.
adverb
10.
without a companion or date:
to go stag to a dance.
noun
1.
the adult male of a deer, esp a red deer
2.
a man unaccompanied by a woman at a social gathering
3.
(stock exchange, Brit)

a speculator who applies for shares in a new issue in anticipation of a rise in price when trading commences in order to make a quick profit on resale
(as modifier): stag operations

4.
(modifier) (of a social gathering) attended by men only
5.
(modifier) pornographic in content: a stag show
adverb
6.
without a female escort
verb (transitive)
7.
(stock exchange) to apply for (shares in a new issue) with the intention of selling them for a quick profit when trading commences
stack Zs
In addition to the idiom beginning with stag