Englishquantitative tightening /ˌkwɒntɪtətɪv ˈtʌɪtnɪŋ 
, ˌkwɒntɪtətɪv ˈtʌɪtənɪŋ , ˌkwɒntɪteɪtɪv ˈtʌɪtnɪŋ , ˌkwɒntɪteɪtɪv ˈtʌɪtənɪŋ /
▸ noun [mass noun] Finance the reduction of a central bank's balance sheet by selling securities or allowing them to mature without reinvesting them, especially in order to reduce excess liquidity resulting from quantitative easing:
the Federal Reserve is reducing the size of the balance sheet through quantitative tightening.