cheer someone's up

Animar a alguien - Cheer someone's up, to make someone feel better. Hacer sentir bien a alguien.

Example:

Eating some chocolate will cheer you up - Comer un poco de chocolate te animará.

to rub salt in/into the wound

Echarle limón a la herida - to rub salt in/into the wound. To make a difficult situation worse for someone. Hacer que una situación difícil empeore para alguién.

Example:

After the fraud, The politician celebrating his victory rubbed salt into the wound. - Después del fraude, el político celebrando su victoria le echó limón a la herida.

Rip one's off

Timar, Estafar. - Rip one's off . To steal , to cheat someone.

Example:

I changed my smart phone for an old bike.
The next day the bike didn't start because it's a piece of junk.
Aww no, the guy ripped me off.

Cambié mi celular inteligente por una motocicleta vieja.
Al siguiente día la motocicleta no prendió porque es un cacharro.
Oh no, el chico me timó/estafó.