Gressume
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
GRESSAME, GRESSUM, or grossome (Scotch, grassum).
In old English law
A fine due from a copyholder on the death of his lord. Plowd. fols.
271, 285; 1 Strange, 654.
Cowell derives it from gersum.