pocket money

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Money for incidental or minor expenses.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A small sum of money given to a child, by a parent or guardian.
• noun A small sum of cash, carried on the person, for small, daily expenses.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun cash for day-to-day spending on incidental expenses