  Recently, a high-energy muon neutrino event was detected in association with
a tidal disruption event (TDE) AT2019dsg at the time about 150 days after the
peak of the optical/UV luminosity. We propose that such a association could be
interpreted as arising from hadronic interactions between relativistic protons
accelerated in the jet launched from the TDE and the intense radiation field of
TDE inside the optical/UV photosphere, if we are observing the jet at a
moderate angle (i.e., approximately 10-30 degree) with respect to the jet axis.
Such an off-axis viewing angle leads to a high gas column density in the line
of sight which provides a high opacity for the photoionization and the
Bethe-Heitler process, {and allows the existence of an intrinsic long-term
X-ray radiation of comparatively high emissivity}. As a result, the cascade
emission accompanying the neutrino production, which would otherwise overshoot
the flux limits in X-ray and/or GeV band, is significantly obscured or
absorbed. Since the jets of TDEs are supposed to be randomly oriented in the
sky, the source density rate of TDE with an off-axis jet is significantly
higher than that of TDE with an on-axis jet. Therefore, an off-axis jet is
naturally expected in a nearby TDE being discovered, supporting the proposed
scenario.
