abate
verb
formal uk/əˈbeɪt/ us [ I ]
if something such as a price or level abates, it goes up more slowly than before, or it goes down:
Gains in oil prices are unlikely to abate within the next few months.
[ I or T ]
to become or make something become weaker, lower, less serious, etc.:
Inflation is finally showing signs of abating.
The mayor plans to abate air pollution in the city by limiting traffic.