Definition of gilli:
(n) :
(British, Ireland, Scotland) A fishing and hunting guide; a man or boy who attends to a person who is fishing or hunting, especially in Scotland.
(n) :
(Scotland, originally) A male attendant of a Scottish Highland chief.
(v) :
(intransitive) To be a gillie, a fishing or hunting guide, for (someone).
(n) :
(Scotland) A gill of an alcoholic drink.
(n) :
A surname.