  We present an in-depth analysis of transverse momentum dependent (TMD)
distributions of twist-three. In particular, we focus on evolution equations,
symmetry relations, parameterization, interpretation, small-b asymptotic
behaviour and the structure of singularities. The starting point of discussion
are the correlators with the definite TMD-twist. By considering suitable
combinations of these correlators, we introduce physical TMD distribution of
twist-three that can be used for practical applications. We also establish
relations with generic TMD distribution of twist-three, and demonstrate that
their evolution equations are autonomous in the large-$N_c$ limit.
