1. to remove liquid from something by allowing it to flow away
We need to drain the pool before winter.
Precisamos drenar a piscina antes do inverno.
2. to gradually use up or deplete resources, energy, or funds
The medical bills were draining their savings.
As contas médicas estavam drenando suas economias.
3. to remove accumulated fluid from a body cavity or wound for medical purposes
The surgeon will drain the abscess.
O cirurgião vai drenar o abscesso.