nest egg

money saved and held in reserve for emergencies, retirement, etc.
a natural or artificial egg placed in a nest to induce a hen to continue laying eggs there.

1600–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nest egg
1.  a fund of money kept in reserve; savings
2.  a natural or artificial egg left in a nest to induce hens to lay their eggs in it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Nor was it money, even though he is sitting on a shrinking nest egg.
Yet that is exactly what you do when you put money into a retirement nest egg.
In other words, if your money is not earning more than the rate of inflation,
  you will lose part of your nest egg's buying power.
Develop a savings plan to create a nest egg for your retirement.
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