The verb is pronounced /dɪkri:s/. The noun is pronounced /di:kri:s/.
( decreased)
1.
When something decreases or when you decrease it, it becomes less in quantity, size, or intensity.
Population growth is decreasing by 1.4% each year...
The number of independent firms decreased from 198 to 96...
Raw-steel production by the nation’s mills decreased 2.1% last week...
Since 1945 air forces have decreased in size...
Gradually decrease the amount of vitamin C you are taking...
We’ve got stable labor, decreasing interest rates, low oil prices.
VERB : V by amount , V from/to amount , V amount , V in n , V n , V-ing
2.
A decrease in the quantity, size, or intensity of something is a reduction in it.
...a decrease in the number of young people out of work...
Bank base rates have fallen from 10 per cent to 6 per cent–a decrease of 40 per cent.
N-COUNT : oft N in/of n