fiddle

• violin; raised edge which prevents objects from falling off flat surfaces (on a ship); swindle, deception, fraud (british slang)
play the violin; engage in; mess around; idle, fidget; cheat, swindle (british slang)
if you fiddle with something, you keep moving it or touching it with your fingers.
when people fiddle documents that concern money, they alter them dishonestly in order to get money for themselves; an informal use.
a fiddle is a dishonest action or scheme to get money; an informal use.
a fiddle is also a violin; an informal use.
if you play second fiddle to someone, your position is less important than theirs in something that you are doing together.
see also fiddling.
if you fiddle around or fiddle about with something, you keep moving it or touching it with your fingers.