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We study a Dark Matter (DM) model in which the dominant coupling to thestandard model occurs through a neutrino-DM-scalar coupling. The new singletscalar will generically have couplings to nuclei/electrons arising fromrenormalizable Higgs portal interactions. As a result the DM particle $X$ canconvert into a neutrino via scattering on a target nucleus $\mathcal{N}$: $ X +\mathcal{N} \rightarrow \nu + \mathcal{N}$, leading to striking signatures atdirect detection experiments. Similarly, DM can be produced in neutrinoscattering events at neutrino experiments: $ \nu + \mathcal{N} \rightarrow X +\mathcal{N}$, predicting spectral distortions at experiments such as COHERENT.Furthermore, the model allows for late kinetic decoupling of dark matter withimplications for small-scale structure. At low masses, we find that COHERENTand late kinetic decoupling produce the strongest constraints on the model,while at high masses the leading constraints come from DM down-scattering atXENON1T and Borexino. Future improvement will come from CE$\nu$NS data,ultra-low threshold direct detection, and rare kaon decays.

Dark Matter-Neutrino Interconversion at COHERENT, Direct Detection, and the Early Universe