n.[C]

1. 弧，弧形
   An arc is a part of the circumference of a circle or other curved lines.

   弧是圆周或曲线的一部分。

2. 【电】电弧，弧光
   an arc lamp

   弧光灯

3. 弧形物，弓形物

v.

1. 做弧形运动
2. 【电】形成电弧

n.

1. a curve forming part of the circumference of a circle or other figure.
   ▸a curving trajectory.
   ▸ [as modifier] Mathematics  indicating the inverse of a trigonometrical function:

   arc cosine.
2. a luminous electrical discharge between two points.
3. (in a novel, play, film, etc.) the development or resolution of the narrative or principal theme:
   the emotional arc of the movie.

v.

1. move with a curving trajectory.
2. [as noun arcing] the forming of an electric arc.