knock down
US /nɑːk daʊn/
UK /nɑːk daʊn/

1.
derrubar, abater
to hit someone or something so that they fall to the ground
:
•
The boxer managed to knock down his opponent in the first round.
O boxeador conseguiu derrubar seu oponente no primeiro round.
•
The strong wind threatened to knock down the old tree.
O vento forte ameaçava derrubar a árvore velha.