Be a dirty word
Definition 1 of 1
Pro Tip 1/3Negative Connotation
It means there's strong dislike or disapproval towards something within a particular context. 
In environmentally conscious circles, 'plastic' has become a dirty word.
Pro Tip 2/3Cultural Variance
Different cultures or groups may have varying reactions to what they consider a dirty word. 
In our nonprofit, 'commercialization' is a dirty word, unlike in the corporate world.
Pro Tip 3/3Emotional Impact
Using it can evoke strong emotions, often to highlight societal values and concerns. 
To the veteran activists, 'compromise' had become a dirty word.