downgrading

noun
1
the act of moving somebody/something down to a lower rank or level
کاهش رتبه, تنزل درجه, تنزل
2
the act of making something/somebody seem less important or valuable than it/they really are
تقلیل اهمیت, بی ارزش کردن, کاهش ارزش
the downgrading of animal welfare