plummet

• 名词，指系在铅垂线末端的金属重物或铅锤，用于建筑和测量中确定垂直方向；也可作动词，意为垂直落下或急剧下降。

A noun referring to the metal weight or bob attached to the end of a plumb line, used in construction and surveying to determine vertical alignment.

1. Plumb bobC2formal

   A weight, typically made of lead or metal, attached to a line and used to determine vertical alignment or depth.

   铅锤

   • The builder used a plummet to ensure the wall was perfectly vertical.
   • He dropped the plummet into the well to measure its depth.
   • The plummet swung gently as the surveyor checked the alignment.

   同义词plumbplumb bob

• 动词，表示突然而迅速地下降或急剧减少，常用于价格、数量或水平。

A verb used to indicate a sudden and rapid fall or drop, often in value, amount, or level.

1. Drop sharplyB2formal

   To fall or drop straight down at a high speed, often used for prices, values, or physical objects.

   急剧下降

   • The stock market plummeted after the announcement.
   • Temperatures plummeted overnight, causing frost.
   • The bird plummeted from the sky to catch its prey.

   同义词crashdeclinedivedropfallnosediveplungesinktumble

   反义词ascendclimbriseskyrocketsoar