1. 拱;拱门;拱形结构
    An arch is a structure that is curved at the top and is supported on either side by a pillar, post, or wall.

arch什么意思

2. 弧形;弧形运动
    An arch is a curved line or movement.

3. 足弓;足背
    The arch of your foot is the curved section at the bottom in the middle.

4. 弓着,佝着（背）等
    If you arch a part of your body such as your back or if it arches, you bend it so that it forms a curve.

    e.g. Don't arch your back, keep your spine straight.
           别佝着背，把腰挺直。

5. （表示惊奇或不赞同）扬起（眉毛）
    If you arch your eyebrows or if they arch, you move them upwards as a way of showing surprise or disapproval.

arch

    e.g. 'Oh really?' he said, arching an eyebrow.
           “哦，真的吗？”他扬起一边的眉毛说。

6. 拱起；成弓形；呈弧形运动
    If something arches in a particular direction, it makes a curved line or movement.

arch什么意思

    e.g. I gazed up at the domed ceiling arching overhead.
           我抬头凝望着上方弧形的穹顶。

7. 神秘的；淘气的；调皮的
    An arch look is mysterious and mischievous.

arch的解释

    e.g. Both of them looked at him with that curious, slightly amused and even arch expression.
           他们俩都看着他，带着一副好奇的、有点觉得好笑甚至是淘气的表情。

8. 傲慢自大的
    If you say that someone is arch, you are criticizing them for talking or behaving as if they are better or more important than other people.

    e.g. Their attempts to be casual have so far just looked arch or patronising.
           他们本想做出漫不经心的样子，结果反而显得傲慢自大或自视甚高。

9. see also: arched