What does 'Bull Flattener' mean
Bull flattener is a yieldrate environment in which longterm rates are decreasing at a rate faster than shortterm rates. This causes the yield curve to flatten as the shortterm and longterm rates start to converge.
BREAKING DOWN 'Bull Flattener'
When the yield curve is moving, it is either steepening or flattening. These fluctuations occur due to investor demand, changes in interest rates and institutional investors trading large blocks of fixedincome securities.
If the yield curve is exhibiting bull flattener behavior, the spread between the longterm rate and the shortterm rate is getting smaller because longterm rates are decreasing as shortterm rates are increasing. This could occur as more investors choose longterm bonds relative to shortterm bonds, which drives longterm bond prices up and reduces yields.

Bear Flattener
A yieldrate environment in which shortterm interest rates are ... 
Bull Steepener
A change in the yield curve caused by shortterm rates falling ... 
Flat Yield Curve
A yield curve in which there is little difference between shortterm ... 
Yield Curve Risk
The risk of experiencing an adverse shift in market interest ... 
Bear Steepener
A widening of the yield curve caused by longterm rates increasing ... 
Term Structure Of Interest Rates
The relationship between interest rates or bond yields and different ...

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