plummet
🇺🇸
/ˈplʌmɪt/
🇬🇧
/ˈplʌmɪt/
To drop down quickly and suddenly from a high place or position.
The bird seemed to momentarily hover before it plummeted down to the earth.
鳥は一瞬空中に浮かんでいるように見えた後、地面に向かって急降下した。