  When subjected to an external stress that exceeds the yield stress
($\sigma_\mathrm{Y}$), yield stress fluids (YSFs) undergo a solid-to-liquid
transition. Despite the extensive studies, there has been limited attention to
the process of liquid-to-solid transition. This work examines the
solidification of YSFs through capillary imbibition, easily observed in the
processes of wetting, coating, spreading, and wicking. During gradual
deceleration of the capillary rise, YSFs display an unexpected flowing
behavior, even when subjected to stresses below the $\sigma_\mathrm{Y}$. We
propose a model with numerical solutions based on rheological properties of
YSFs and slip to capture this unusual, yet universal behavior.
