to cover yourself, to cover you, to cover for you
No salgas con este calor sin cubrirte la cabeza.
Don’t go out in this heat without covering your head.
¿Sabes lo que me costó cubrirte el año pasado?
Do you know how much it cost me to cover for you last year?
— Madre (2009)
Cuando estés enfermo, debes cubrirte la boca.
When you're sick, you should cover your mouth.