  We present a new mechanism to generate a coherently oscillating dark vector
field from axion-SU(2) gauge field dynamics during inflation. The SU(2) gauge
field acquires a nonzero background sourced by an axion during inflation, and
it acquires a mass through spontaneous symmetry breaking after inflation. We
find that the coherent oscillation of the dark vector field can account for
dark matter in the mass range of $10^{-13}-1$ eV in a minimal setup. In a more
involved scenario, the range can be wider down to the fuzzy dark matter region.
One of the dark vector fields can be identified as the dark photon, in which
case this mechanism evades the notorious constraints for isocurvature
perturbation, statistical anisotropy, and the absence of ghosts that exist in
the usual misalignment production scenarios. Phenomenological implications are
discussed.
