Definitions from Wiktionary ( )

▸ noun:  (countable) An adult male deer, especially a red deer.
▸ noun:  (countable, chiefly Scotland) A young horse (colt or filly).
▸ noun:  (by extension, countable, obsolete) A romping girl; a tomboy.
▸ noun:  (countable) An improperly or late castrated bull or ram – also called a bull seg (see note under ox).
▸ noun:  (countable, finance) An outside irregular dealer in stocks, who is not a member of the exchange.
▸ noun:  (countable, finance) One who applies for the allotment of shares in new projects, with a view to sell immediately at a premium, and not to hold the stock.
▸ noun:  (countable, usually attributive) An unmarried man; a bachelor; a man not accompanying a woman at a social event.
▸ noun:  (countable) A social event for men held in honor of a groom on the eve of his wedding, attended by male friends of the groom; sometimes a fundraiser.
▸ noun:  (countable, slang) An informer.
▸ noun:  (uncountable, UK, military, slang) Guard duty.
▸ noun:  (countable) A stag beetle (family Lucanidae).
▸ noun:  (countable) The Eurasian wren, Troglodytes troglodytes.
▸ verb:  (intransitive, British) To act as a "stag", an irregular dealer in stocks.
▸ verb:  (transitive) To watch; to dog, or keep track of.
▸ adverb:  Of a man, attending a formal social function without a date.

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