Definition of "Bull" :
noun: a serious and ludicrous blunder
"He made a bad bull of the assignment."
noun: mature male of various mammals of which the female is called cow'; e.g. whales or elephants or especially cattle
noun: uncastrated adult male of domestic cattle
noun: obscene words for unacceptable behavior
"I put up with a lot of bullshit from that jerk."
noun: a formal proclamation issued by the pope (usually written in antiquated characters and sealed with a leaden bulla)
noun: the center of a target
noun: the second sign of the zodiac; the sun is in this sign from about April 20 to May 20
noun: (astrology) a person who is born while the sun is in Taurus
noun: a large and strong and heavyset man
"He was a bull of a man."
noun: an investor with an optimistic market outlook; an investor who expects prices to rise and so buys now for resale later
noun: uncomplimentary terms for a policeman
verb: advance in price
"Stocks were bulling."
verb: speak insincerely or without regard for facts or truths
verb: try to raise the price of stocks through speculative buying
verb: push or force
"He bulled through his demands."