Brewer's: Cutter's Law
Not to see a fellow want while we have cash in our purse. Cutter's law means the law of purse-cutters, robbers, brigands, and highwaymen.
“I must put you in cash with some of your old uncle's broad-pieces. This is cutter's law; we must not see a pretty fellow want, if we have cash ourselves.” —Sir W. Scott: Old Mortality, chap ix