fin

• 名词，指鱼或其他水生动物身上的扁平薄片状附肢，用于游动、控制和保持平衡；也可指类似鳍的片状物或散热片、尾翼等。

A noun referring to a thin, flat appendage on the body of a fish or other aquatic animal, used for propulsion, steering, and balance.

1. Fish appendageA2formal

   A thin, flat part on the body of a fish, used for swimming and steering.

   鱼鳍

   • The shark's dorsal fin cut through the water.
   • Fish use their fins to change direction quickly.
   • The tropical fish had brightly colored fins.

2. Aircraft or vehicle partB2formal

   A fixed or adjustable vertical or horizontal surface on an aircraft, car, or boat for stability.

   稳定面

   • The airplane's tail fin helps maintain stability during flight.
   • The car's rear fin was a popular design in the 1950s.
   • The boat's fin keel prevents it from capsizing.

   同义词stabilizertail fin

• 动词，指用脚蹼在水中游泳或移动，也指给某物装上脚蹼。

A verb meaning to swim or move through water using fins, or to equip with fins.

1. To swim using finsB2informal

   To swim or move through water using fins, typically in diving or snorkeling.

   使用脚蹼游泳

   • The diver finned gracefully through the coral reef.
   • She finned slowly to avoid startling the fish.
   • He finned his way to the surface for air.

   同义词flipper

2. To equip with finsC1formal

   To attach or provide fins to something, such as a vehicle or equipment.

   安装鳍

   • The engineers finned the rocket for better stability.
   • They finned the surfboard to improve its performance.
   • The car was finned for aerodynamic efficiency.