wane
🇺🇸
/weɪn/
🇬🇧
/weɪn/
To decrease in strength, size, or intensity.
The popularity of that TV show has been waning for months.
そのテレビ番組の人気は数ヶ月間減少している。
To decrease in brightness or to appear smaller, as a moon does after full moon.
After the full moon, the moon starts to wane.
満月の後、月は小さくなっていく。