Basal sliding refers to the movement of a glacier over its bed, facilitated by the presence of meltwater that reduces friction between the ice and the underlying rock. This process is an important component of glacier dynamics and contributes significantly to the overall movement of glaciers, especially in temperate regions where melting is more common.
Source Cuffey, K. M., & Paterson, W. S. B. (2010). The Physics of Glaciers. Elsevier.