Definify.com
Webster 1913 Edition
Wild-cat
Wild′-catˊ
,Adj.
1.
Unsound; worthless; irresponsible; unsafe; – said to have been originally applied to the notes of an insolvent bank in Michigan upon which there was the figure of a panther.
2.
(Railroad)
Running without control; running along the line without a train;
as, a
. wild-cat
locomotive