To give someone a lot of money means to provide them with a large sum of money, either as a gift or through payment. This can refer to giving someone a significant amount of money in one go, such as a large inheritance, winnings from a contest or lawsuit, or compensation for services rendered. It could also mean making regular payments over time, such as an allowance, salary, or child support. In any case, the phrase implies that the person is receiving a substantial amount of money and suggests generosity on the part of the giver.