B1 to become or to make something become smaller in size, amount, degree, importance, etc.:
The plane reduced speed as it approached the airport.
› to heat a liquid until it becomes thicker and less in quantity; to become thicker and less in quantity in this way:
Simmer until the liquid has reduced by about one third.
More examples
- The government has pledged to reduce the amount of chemicals used in food production.
- Wearing the correct type of clothing will reduce the risk from radiation.
- When one airline reduces its prices, the rest soon follow suit.
- Mindful of the poor road conditions, she reduced her speed to 30 mph.
- We are firmly committed to reducing unemployment.
Thesaurus: synonyms and related words