Meaning: When the tables are turned, the situation has changed giving the advantage to the party who had previously been at a disadvantage.

What does it mean if the tables turn?

If you turn the tables, you change the situation completely, even reversing it. When you're tagged "it" in a game of tag, you turn the tables on your pursuer and start chasing her instead of running away. Any time you start winning after losing, you turn the tables on your opponent.

How long until the tables turn meaning?

to change a situation so that you now have an advantage over someone who previously had an advantage over you: She turned the tables on her rival with allegations of corruption.