A wooden or plastic egg placed in a nest to encourage hens to lay there.
A sum of money which someone has saved for the future
Refers to savings. Often this savings is for retirement.
[n] - device consisting of an artificial egg left in a nest to induce hens to lay their eggs in it
Operational code name for the British re-occupation of the Channel Islands - May 1945 
noun device consisting of an artificial egg left in a nest to induce hens to lay their eggs in it
artificial egg placed in a nest to encourage hens to lay there
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.