Is one forbidden to rub saliva into the ground on Shabbat?

ShabbatSmoothing (Memarei'ach)

Synopsis

The Mechaber rules one may not rub saliva into the ground because it smooths the surface (mashveh gumot). However, one may step on it casually since one does not intend to smooth, and even though it may smooth incidentally, it is permitted because of the repulsiveness (ma'isuta) of the saliva.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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