red cent
US /rɛd sɛnt/
UK /rɛd sɛnt/

1.
un centime, rien du tout
a very small amount of money; nothing at all (used in negative contexts)
:
•
I wouldn't give him a red cent for his advice.
Je ne lui donnerais pas un centime pour son conseil.
•
After all that work, he didn't earn a red cent.
Après tout ce travail, il n'a pas gagné un centime.