The term "critical turn" can refer to a point in time or space where something significant happens, often leading to a change in direction or outcome. Full definition
Are you are frustrated by recent stock market volatility, but still concerned you might miss critical turning points in the market? (morpheustrading.com)
Clients, other lawyers and judges will be pleased with the result in far more cases than when something critical turns out to have been changed or omitted unintentionally. (slaw.ca)
Were these all different, critical turning point in your life? (lehmannmaupin.com)