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In this work, we prove a threshold theorem for the 2D Navier-Stokes equationsposed on the periodic channel, $\mathbb{T} \times [-1,1]$, supplemented withNavier boundary conditions $\omega|_{y = \pm 1} = 0$. Initial datum is taken tobe a perturbation of Couette in the following sense: the shear component of theperturbation is assumed small (in an appropriate Sobolev space) but importantlyis independent of $\nu$. On the other hand, the nonzero modes are assumed size$O(\nu^{\frac12})$ in an anisotropic Sobolev space. For such datum, we provenonlinear enhanced dissipation and inviscid damping for the resulting solution.The principal innovation is to capture quantitatively the \textit{invisciddamping}, for which we introduce a new Singular Integral Operator which is aphysical space analogue of the usual Fourier multipliers which are used toprove damping. We then include this SIO in the context of a nonlinearhypocoercivity framework.

Stability threshold of nearly-Couette shear flows with Navier boundary conditions in 2D