Yield Pickup
A gain in yield achieved by selling one bond and buying another with a higher yield.
Investopedia Commentary
Usually, this is simply called "pickup". If the bond rating/credit risk is the same between the two bonds then this is a great strategy, but be careful that the bond you're buying isn't because its credit rating is poorer.
Related Links
Advantages Of Bonds
Advanced Bond Concepts
Bond Basics Tutorial
Asset Allocation within Fixed Income
How the Distinction Between APR and APY Affects You
See also: Pickup, Yield, Yield Curve, Yield Equivalence, Yield To Call, Yield To Maturity