  We revisit the two dimensional non-Abelian Thirring model in order to
investigate its fixed point structure and the corresponding renormalization
group (RG) flow. For this purpose we discuss the bosonization of the model, and
we present different, but of course equivalent, bosonic versions of the theory.
The bosonic theories are illuminating in that they exhibit the fixed points in
a manifest way, and also possess a remarkable strong/weak duality that sheds
light on the fixed point structure of the theory. We study the RG flow through
the computation of the Zamolodchikov $C$-function and of the $\beta$-function
in the large-level limit. Within this framework, we discuss how close to the
infrared fixed point the RG flow can reach, since this point is strictly
unachievable due to an emergent gauge invariance.
