  We present a new scheme for the general computation of cosmic propagators
that allow to interpolate between standard perturbative results at low-k and
their expected large-k resummed behavior. This scheme is applicable to any
multi-point propagator and allows the matching of perturbative low-k
calculations to any number of loops to their large-k behavior, and can
potentially be applied in case of non-standard cosmological scenarios such as
those with non-Gaussian initial conditions. The validity of our proposal is
checked against previous prescriptions and measurements in numerical
simulations showing a remarkably good agreement. Such a generic prescription
for multi-point propagators provides the necessary building blocks for the
computation of polyspectra in the context of the so-called Gamma-expansion
introduced by Bernardeau et al. (2008). As a concrete application we present a
consistent calculation of the matter bispectrum at one-loop order.
