The phrase "tide turn" means a sudden change or shift in a situation or outcome. It's like when things were going bad, but then they start getting better. Full definition
When it comes to the 2010 U.S. Senate Race, are the political tides turning in Senator Gillibrand's direction? (maristpoll.marist.edu)
«Just as the push for proxy access — the shareholder right to nominate board members to be included in the company proxy — started with a trickle and overwhelmed management opposition, we may see the same tide turning against bosses on a 2 ˚C scenario analysis. (carbontracker.org)
That heritage would have been fine, but it came about a decade too late, because just as the Aviator hit the market, the consumer tide turned away from truck - based SUVs to the more carlike crossover SUVs, so named because they crossed over from the car side, rather than the truck side. (articles.orlandosentinel.com)