  We investigate the effects of electroweak bremsstrahlung on bino-like
neutralino dark matter pair annihilations in the minimal supersymmetric
standard model (MSSM). We calculate the nonrelativistic pair annihilation cross
sections via $W$-strahlung from leptonic final states, $\chi\chi$ $\to$
$W\ell\bar{\nu}$, and compare them with the contributions of the relevant
two-body final states. We explore the case that sleptons lie below the TeV
scale, while squarks are extremely heavy. It is found that the electroweak
bremsstrahlung can give a dominant contribution to the cross section for some
parameter regions which include slepton coannihilation regions with the
observed relic abundance. We also evaluate the neutrino spectra at injection in
the Sun. It is shown that energetic neutrinos via weak bremsstrahlung processes
can be dominant over contributions of the two-body final states.
