  We present ZTF18aaqjovh (SN 2018bvw), a high-velocity ("broad-lined")
stripped-envelope (Type Ic) supernova (Ic-BL SN) discovered in the Zwicky
Transient Facility one-day cadence survey. ZTF18aaqjovh shares a number of
features in common with engine-driven explosions: the photospheric velocity and
the shape of the optical light curve are very similar to that of the Type Ic-BL
SN 1998bw, which was associated with a low-luminosity gamma-ray burst (LLGRB)
and had relativistic ejecta. However, the radio luminosity of ZTF18aaqjovh is
almost two orders of magnitude fainter than that of SN 1998bw at the same
velocity phase, and the shock velocity is at most mildly relativistic
(v=0.06-0.4c). A search of high-energy catalogs reveals no compelling GRB
counterpart to ZTF18aaqjovh, and the limit on the prompt GRB luminosity of
$L_{\gamma,\mathrm{iso}} \approx 1.6 \times 10^{48}$ erg/sec excludes a
classical GRB but not an LLGRB. Altogether, ZTF18aaqjovh represents another
transition event between engine-driven SNe associated with GRBs and "ordinary"
Ic-BL SNe.
