in for a penny, in for a pound

Do not stop at half-measures; once involved, even a little, one is involved a lot. This term, which originally meant that if one owes a penny one might as well owe more, dates from the seventeenth century. Thomas Ravenscroft wrote, “Well, that, O’er shooes, o’er boots, And In for a penny, in for a Pound” (The Canterbury Guests, 1695, 5.1). It was quoted over and over. Dickens, always intrigued with debt, used it in at least three of his novels (Nicholas Nickleby, Oliver Twist, The Old Curiosity Shop). Today it is common mostly in Britain and Ireland, where the pound is a unit of currency, but it is still occasionally heard in America.