  The WIMP dark matter (DM) hypothesis now is in an awkward position, owing to
the stronger and stronger exclusion from DM direct detection. In this article
we design a mechanism to evade this constraint.The idea is simple. DM has a
companion, and they are both charged under the DM protecting symmetry G; they
admit the trilinear coupling DM-DM-companion, so the latter provides a portal
to the standard model (SM) via, for instance, the coupling to Higgs
doublet.Then, DM semi-annihilates into the companion to arrive correct relic
density, without leaving DM-nucleon scattering signal. The idea can be realized
for ZN symmetric models with N >2.We stress that this mechanism has the
characteristics of co-annihilation, and as a matter of fact its effect becomes
necessary near or above the TeV region. This means that it may be difficult to
detect our dark matter directly or indirectly.
