消えていく

fade away

→ 消える
phrase Rare #39,843
fade away Describes something gradually disappearing or moving farther away. The ていく pattern emphasizes a change that continues from the present onward.
JA: 夕日が山の向こうに消えていく。
EN: The setting sun is fading away beyond the mountains.

消えていくを追いかけた

I chased after the fading light.

流行古くなって消えていく

Fashions grow old and fade away.

消えていくの中を歩いて行く

I walk through the fading light.

さっき姉ちゃん空に消えていく夢をまさか

I just had a dream… My big sister disappeared into the sky… No way…

— 天気の子 (2019)