Bull market
A period of rising stock prices.
Bear market
A period of falling stock prices.
A top dog
A person who is successful or dominant in their field.
A unicorn
A start-up (= new business) whose value is considered to be over $1 billion.
A cash cow
A business or investment that generates a lot of profit.
Horse trading
Negotiating or bargaining, often in a tough or aggressive manner.
The lion's share
The largest portion of something
A fat cat
A wealthy and powerful person, especially a business person or politician.
*Monkey business
Joking around/illegal activities.
Shark tank
A competitive and often ruthless business environment.