buy up

buy a dog and bark oneself

To do something that one has hired someone else to do.

buy a ticket to

Used to indicate that someone is in agreement with an assertion, statement, or suggestion.

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

buy into

To believe (something, especially something implausible); to accept (a craze, fad, or notion) as valid.

buy it

To believe any particular assertion or idea; to support it.

buy out

to purchase the entire stock or extent of something

buy straw hats in winter

Of stocks, to buy when both demand and price are low, so as to sell when demand and price are high.

buy the farm

To die; generally, to die in battle or in a plane crash.