Webster's Revised Unabridged Dictionary · 1913

Pash

Pash , transitive verb

[Probably of imitative origin, or possibly akin to box to fight with the fists.]

To strike; to crush; to smash; to dash in pieces. [Obsolete] — Shakespeare
I'll pash him o'er the face. — P. Plowman

Pash , noun

[Scot., the pate. Compare Pash, transitive verb]

1.
The head; the poll. [Rare]
A rough pash. — Shakespeare
2.
A crushing blow. [Obsolete]
3.
A heavy fall of rain or snow. [Provincial English]