Of a man, attending a formal social function without a date.

(countable) An adult male deer. / (countable) A colt, or filly. / (by extension, countable, obsolete) A romping girl; a tomboy.

(intransitive, Britain) To act as a "stag", an irregular dealer in stocks. / (transitive) To watch; to dog, or keep track of.

plural of stag

simple past tense and past participle of stag

present participle of stag

(Britain) bachelor party

Any of numerous large beetles of the family Lucanidae, the males having elaborate mandibles resembling the antlers of a stag / The species Lucanus cervus, which is the largest beetle in the UK.

(Britain) A bachelor party; a party held for a man who is about to be married.

(slang, historical) A kind of pornographic film produced clandestinely in the early to mid-20th century, typically short and without sound. Usually intended for a male audience.