Explanation
Expresses that a situation or condition is continuing to increase or decrease in one direction.
Formation
Verb-dictionary form + 一方だ
Detailed explanation
The ～一方だ grammar point is used when something is trending in a single direction over time, often increasing or worsening. It emphasizes that the tendency keeps going in one direction.
Examples
世界の人口は増える一方だ。
Sekai no jinkou wa fueru ippou da.
The world's population continues to increase.
この町の治安は悪化する一方だ。
Kono machi no chian wa akka suru ippou da.
Public safety in this town is getting worse and worse.
僕の日本語は上達する一方だ。
Boku no nihongo wa joutatsu suru ippou da.
My Japanese keeps improving.
夏になると、暑さが厳しくなる一方だ。
Natsu ni naru to, atsusa ga kibishiku naru ippou da.
As summer arrives, it just keeps getting hotter.
Practice
Grammar content sourced from hanabira.org.