  We study the transverse spin and the Belinfante spin momentum in a gain-loss
balanced waveguide, known to be one of the first and most studied examples of
$\mathcal{PT}$-symmetric systems. Such a guide supports the spectral
singularities leading to infinite scattering amplitudes for both reflection and
transmission. We show that near the spectral singularity there can be dramatic
enhancement of the transverse spin and the transverse spin momentum. Note that
these exotic spin and spin momentum have recently been observed experimentally
despite having tiny magnitudes, making it worthy to explore ways and means to
enhance these fundamentally important elusive quantities.
