〜一方だ
Keeps getting 〜一方だ
Meaning
"Keeps getting ~", "goes on ~ing" — a one-way trend.
Formation
[verb dictionary] + 一方だ
Notes
The trend only moves one way and never reverses, and it is usually an unwelcome one. It needs a verb of change — 増える, 減る, 悪くなる — not a state.
Examples
物価(ぶっか)は上(あ)がる一方(いっぽう)です。
Prices just keep going up.
Breakdown
彼(かれ)の病気(びょうき)は悪(わる)くなる一方(いっぽう)です。
His illness only gets worse.
Breakdown
若者(わかもの)の人口(じんこう)は減(へ)る一方(いっぽう)です。
The young population keeps shrinking.
Breakdown
電気代(でんきだい)は高(たか)くなる一方(いっぽう)です。
Electricity bills just keep rising.
Breakdown
環境(かんきょう)は悪化(あっか)する一方(いっぽう)です。
The environment goes on deteriorating.
Breakdown
⚠️ Often confused with
〜かける / 〜かけだ
Half-done 〜かける
An action begun but not finished — "half-~", "start to ~ (and stop)".
〜きる / 〜きれない
Completely / cannot finish 〜きる
Carries an action right through — "do ~ completely". The negative きれない means "cannot f...
〜つつある
In the process of 〜つつある
"Is in the process of ~ing" — a gradual change still under way.