买下

买下	mǎi xià	to purchase (sth expensive, e.g. a house); to acquire (a company, a copyright etc)
买	mǎi	to buy / to purchase
下	xià	down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action