Critics suggest these big ISPs aren't building out their networks enough to keep pace with the huge growth in demand.
I haven't found the definition of "build out" in the dictionary, so I looked "out" up, and find the following definition:
out: used to say that something is done carefully or completely
And examples about the usage:
I spent all morning cleaning out the kitchen cupboards.
In the summer months the soil dries out quickly.
I want to know if "out" fit in with the definition. And I guess "build out" means "build carefully and completely", doesn't it? Because I have encountered the expression twice, I want to know the exact meaning, but I cannot find it on the Internet or dictionary.