A small fund of money for incidental expenses, as in an office.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "petty cash" in a sentence
"The murders of Yitzak and his two men are the worst; had you not made it appear as if the poor man had fallen on his scythe and his two hired men fled with the petty cash from the kitchen, I have no doubt that we would have had a full-scale riot on our hands in Jaffa by mid-week."