harmfulchange
nounUK /ˈhɑːmfʊl tʃeɪndʒ/
US /ˈhɑːrmfəl tʃeɪndʒ/
A harmful change is a change that makes something worse or hurts it.
The harmful change in the water made the fish sick.
OTHER MEANINGS
2. A change in the body or environment that causes injury or illness.
Smoking causes harmful changes in the lungs.
3. A shift in a situation that makes it less safe or less healthy.
The harmful change in the weather forced the farmers to act.
4. A change to a thing that makes it work less well.
A harmful change to the machine made it stop.