drive off of
pay down : to reduce the total amount of money owed ex: the government could start paying down the national debt.
pay up :to pay (money) promptly, in full, or on demand.
ex: for once our bills are all paid up.
pay off : To result in profit or advantage; succeed
ex: your efforts will eventually pay off. it also means to to pay the full amount on (a debt). ex: I almost have the ranch paid off.
pay out: To give (money) out; spend.
ex: Some stocks reliably pay dividends, portions of a corporation's profits paid out in cash to its shareholders.