1. Jane was poor when she started her own business and she struggled for a long time, but she finally turned the tables and now she’s wealthy.
2. They were beating the other team in the first half, but the tables have turned. Now they’re struggling to keep up and win the game.

Turn the tables originates from tabletop board games such as backgammon. During the game, players would turn the table (game) so they played from their opponent’s position.