“动动脑子”用英语怎么说？

use your loaf

动动脑子

If you tell someone to use their loaf, you are telling them in a slightly angry way that they should think more carefully about what they are doing.

你跟别人说这个习语，就是说用有点生气的口吻让别人做事多动动脑子。

Example: You haven’t even switched the thing on. Come on, Jamie, use your loaf!

例：你连开关都没看。天哪，杰米，长点脑子吧！