But the term "hold back" refers specifically to physically holding back light from the enlarger from hitting the paper, not aesthetically to tonality on the print.
Semantics are very important, especially on the Internet. Of course everyone here talking about it knew what you meant; but it is still awkward at best to those who got what you meant, and potentially quite confusing to someone who is not conceptually sound in the basics of printing.
So, we are not witch hunting you for using a phrase in a non-conventional way. We are just trying to clarify for other potential readers.