  The absolute stability of a dark matter (DM) particle is not a binding
requirement. Here we suggest a few scenarios where the DM particle is liable to
decay via extremely feeble interactions. This can happen via inexplicably small
Yukawa couplings in the simplest conjectures. After setting down such a model,
we go beyond it, thus treading onto scenarios where the spontaneous breakdown
of some gauged $U(1)$ symmetry may lead to intermediate scales, and suitably
suppressed effective operators which allow the DM particle to decay slowly. The
constraints from particle physics as well as cosmology are taken into account
in each case. The last and more involved scenario, studied in detail, suggest a
link between the model parameters that govern neutrino physics on one side, and
the dynamics of a quasi-stable DM particle on the other.
