This means something is changing in one direction. It keeps changing and does not stop.
Verb [dictionary form] + 一方だPrimary
This means something is changing in one direction. It keeps changing and does not stop.
最近、祖母の病状は悪化する一方だ。
Recently, my grandmother's medical condition has only been getting worse.
その頃、都市の人口は増える一方だった。
Around that time, the city's population was only increasing.
新しい仕事を始めてから、覚えることは増える一方です。
Since starting my new job, the number of things to learn just keeps increasing.
物価が上がる一方の状況で、生活は苦しくなるばかりだ。
In a situation where prices are only rising, life just gets harder and harder.
環境問題への関心は高まる一方だが、具体的な解決策は見つかっていない。
Concern for environmental problems continues to grow, but a concrete solution has not been found.
This is like saying "it's only getting worse" or "it's only getting better." It shows a change that keeps going in one way. It is different from 〜ばかりだ. That phrase often shows someone's unhappy feelings. This grammar is also different from 〜つつある. That phrase means something is changing now. This grammar means the change will keep going without stopping.
Don't use this when something happens quickly. For example, you cannot say "The ball bounced 一方だ."
Use this when you want to talk about facts. It is good for news or school papers. You can use it for business talks too. It helps you show how things are changing.
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