A critical moment or point when things begin to change significantly; a point where a situation, policy, or trend shifts.
あの勝利がチームにとっての転換点になった。
That victory became a turning point for the team.
経済学者は政策変更が景気の転換点をもたらすと指摘した。
Economists pointed out that the policy change would bring about a turning point in the economy.
技術革新はしばしば業界の転換点となる。
Technological innovation often becomes a turning point for an industry.