red cent
US /rɛd sɛnt/
UK /rɛd sɛnt/

1.
un centavo, nada
a very small amount of money; nothing at all (used in negative contexts)
:
•
I wouldn't give him a red cent for his advice.
No le daría ni un centavo por su consejo.
•
After all that work, he didn't earn a red cent.
Después de todo ese trabajo, no ganó ni un centavo.