fiddle

A fiddle is a violin when played in a style not like the classical violin.

Example: When I play it like this, it's a fiddle; when I play it like that, it's a violin.

To play without working.

Example: You're fiddling your life away.

To fiddle with something is trying to make something work by adjusting it.

Example: I needed to fiddle with my computer's speakers to get them to work.

To play traditional songs on a violin in a style not like classical music.