1.
When the sun beats down, it is very hot and bright.
PHRASAL VERB
2.
When the rain beats down, it rains very hard.
Even in the winter with the rain beating down, it’s nice and cosy in there.
= pour down
PHRASAL VERB: V P
3.
If you ~ a person who is selling you something, you force them to accept a lower price for it than they wanted to get.
A fair employer, when arranging for the pay of a carpenter, does not try to beat him down...
Beat down the seller to the price that suits you.
= knock down
PHRASAL VERB: V n P, V P n (not pron)