Green’s Dictionary of Slang

dewskitch n.

[? ‘catch one’s due’]

a severe beating, a good thrashing.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor I 2281: It means a dewskitch (a good thrashing).
1873		Sl. Dict.