  We present an observational study of wind acceleration based on four
low-ionization broad absorption line (LoBAL) quasars (J0136, J1238, J1259,
J1344). J0136 and J1344 (group-1) are radio quiet and show large BAL-velocity
shifts as opposed to stable line-locking associated absorption lines (AALs).
Notably, J1344 displays a linear relation between BAL-velocity shift and time
interval over three consecutive epochs, characteristic of compelling evidence
for BAL acceleration. J1238 and J1259 (group 2) exhibit small BAL-velocity
shifts along with steep-spectrum, weak radio emission at 3.0 and 1.4 GHz. All
four quasars have spectral energy distributions (SEDs) with a peak at
$\lambda_{\rm rest }\sim10~\mu$m, suggesting a link between the BAL
acceleration and hot dust emission. The group-2 quasars are redder than group-1
quasars and have a steeper rise at $1<\lambda_{\rm rest }<3~\mu$m in their
SEDs. All but J1238 exhibit a steep rise followed by a plateau-like time
evolution in BAL-velocity shift. Our investigations, combined with previous
studies of BAL acceleration, indicate that (1) the BAL-ISM coupling process is
one of the major avenues for the origin of quasar reddening and patchy
obscuration, (2) AAL outflows are ubiquitous and likely signify large-scale
remnants of BAL winds coupled to interstellar medium (ISM), and (3) wind
deceleration that is closely linked to the BAL-ISM coupling process may produce
weak radio emission in otherwise radio-quiet quasars.
