An adult male of domesticated cattle or oxen, specifically one that is uncastrated, or loosely, any bovine of an aggressive or long-horned breed regardless of age and sex.

A male of domesticated cattle or oxen of any age.

Any adult male bovine.

An adult male of certain large mammals, such as whales, elephants, camels and seals.

A large, strong man.

(finance) An investor who buys (commodities or securities) in anticipation of a rise in prices.

(US, slang) A policeman; a detective; a railroad security guard.

(LGBT, slang) An elderly lesbian.

(UK) A noun "bull" represents the central portion of a target in military firearms.

(Philadelphia, slang) A man or boy (derived from the Philadelphia English pronunciation of “boy”, which is practically a homophone of “bull”)

(uncountable, informal, euphemistic, slang) Clipping of bullshit.

A man who has sex with someone else's partner, with the consent of both.

(slang, uncountable) Beef.

A papal bull, an official document or edict from the Pope.

A seal affixed to a document, especially a document from the Pope.

A lie.

(euphemistic, informal) Nonsense.

(intransitive, often with into or through) To force oneself (in a particular direction).

(agriculture, intransitive, of a cow or heifer) To be in heat; to be ready for mating with a bull.

(agriculture, transitive, of a bull) To mate with .

(finance, transitive) To endeavour to raise the market price of.

(finance, transitive) To endeavour to raise prices in.

To mock; to cheat.

(intransitive) To lie, to tell untruths.

(UK, military) To polish boots to a high shine.

Large and strong, like a bull.

(attributive, of large mammals) Adult male.

(finance) Of a market in which prices are rising (compare bear).

Stupid.