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English definition of “bull”

bull

noun [C]     /bʊl/ FINANCE, STOCK MARKET
someone who expects the price of shares, bonds, currency, etc. to increase, and who buys these investments in order to sell them later for a profit: Bulls believe the US economy is beginning to pick up. → Compare bear
→  bull market
(Definition of bull noun from the Cambridge Business English Dictionary © Cambridge University Press)
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