pinion

• 多义词：指与较大齿轮或齿条啮合的小齿轮；也指鸟类的任何一根大型飞羽；或指鸟的翅膀。

A noun with multiple meanings: a small gear that meshes with a larger wheel or rack; any of the larger flight feathers of a bird; or a bird's wing.

1. Small gearC1formaltechnical

   A gear with a small number of teeth that meshes with a larger gear or rack, often used in machinery to transmit motion.

   小齿轮

   • The pinion engages with the rack to convert rotational motion into linear motion.
   • The mechanic replaced the worn pinion in the gearbox.
   • A small pinion drives the large wheel in this clock mechanism.

2. Bird's flight featherC1formal

   One of the larger primary or secondary feathers of a bird's wing, essential for flight.

   飞羽

   • The falconer carefully examined the bird's pinions for damage.
   • The eagle's pinions were strong and well-formed.
   • A broken pinion can prevent a bird from flying properly.

   同义词flight featherquill

3. Bird's wingC1formal

   The wing of a bird, especially when referring to its structure or function.

   鸟翼

   • The bird flapped its pinions and took off into the sky.
   • The artist sketched the delicate pinions of the swan.
   • The hawk's powerful pinions carried it high above the valley.

   同义词pennonwing

• 过时动词，指将某人的手臂捆绑或束缚住，尤其指把手臂紧绑在身体上或固定物上，使其无法活动。

An archaic verb meaning to bind or restrain someone's arms, especially by tying them to the body or to a fixed object.

1. Bind the arms ofC1formal

   To restrain or immobilize someone by holding or tying their arms.

   反绑双臂

   • The guards pinioned the prisoner's arms behind his back.
   • She was pinioned by the crowd and could not escape.
   • He pinioned his opponent's arms to the ground.

   同义词bindfetterimmobilizemanaclerestrainshackletie uptruss

   反义词freeliberatereleaseunbinduntie

2. Cut the wings offC2formal

   To cut off the pinion (the outer part of a bird's wing) to prevent flight.

   剪翼

   • The falconer pinioned the hawk to keep it from flying away.
   • They pinioned the young birds to stop them from leaving the nest.
   • In some practices, birds are pinioned for domestication.

   同义词clipcutdocklopsheartrim