名詞 deflation:

1. (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind
2. a contraction of economic activity resulting in a decline of prices
3. the act of letting the air out of something

de.fla.tion

n.（名詞）
The act of deflating or the condition of being deflated.
放氣，癟掉：抽氣的動作或縮小的狀態(tài)
Economics A persistent decrease in the level of consumer prices or a persistent increase in the purchasing power of money because of a reduction in available currency and credit.
【經(jīng)濟學(xué)】 通貨緊縮：由于可獲得貨幣和信貸的減少，導(dǎo)致消費品價格水平的持續(xù)下降或貨幣購買力的持續(xù)提高

【引伸】
defla.tionar.y
defla.tionist
n.（名詞）