If you gesticulate, you make movements with your arms or hands, often while you are describing something that is difficult to express in words.
例句
A man with a paper hat upon his head was gesticulating wildly...一个戴纸帽的男子在拼命地打手势。The architect was gesticulating at a hole in the ground.那位建筑师在指着地上的一个洞打手势。