man or woman?
I like to use the clear mascara and just brush along the brow, this keeps them down. I also brush them up and trim them so no extras will bend or fall out of place.
If you are a man and are afraid of using mascara or being caught in the makeup isle, use might use mustache wax. A little goes along way, use a brush they give you when you buy it or a toothbrush might work.