If the sun beats down, it shines very strongly and makes the air very hot.

The tropical sun beat down on them mercilessly. 热带阳光无情地暴晒着他们。

to persuade someone to accept a lower amount of money for something

He wanted £75 for the bike, but I managed to beat him down to £50. 这辆自行车他要价75英镑，但我设法把价格杀到50英镑。