The bull-fiddle is also known as the double this
[PAR] ANY Bowed string instrument may be informally called a fiddle, but "Violin" ..... the 
Welsh crwth, the Cello, the Double Bass ("bull fiddle" or "bass fiddle"), and so... [DOC] [TLE] Bull Fiddle | Definition of Bull Fiddle by Merriam-Webster [PAR] Define bull fiddle: double bass.