yield curve noun2 •The relation between the interest rate (or cost of borrowing) and the time to maturity of the debt for a given borrower in a given currency. •A style of yoga based on a flow between sequential poses and coordinated breathing.His business was clairvoyance. You looked at the yield curve arching and slumping like an inchworm making its inefficient progress, and it told you everything you needed to know. — 2020 formsyield curves