In for a penny, in for a pound!

An expression of 70's street culture that means that if you participate even slightly in something, you are fully involved in the consequences.

Frank: "Charlie got 5 years for that liquor store hold-up, and he was just the look-out!"

Sam: "Well, you know what they say, 'in for a penny, in for a pound!'"

by PJ Poppyjoe June 16, 2005