Money "to Hatch" in Your Old Age
This page is the CodyCross answer for the clue below from Physics, Group 1881, Puzzle 4 (Acceleration).
Question is: Money "to Hatch" in Your Old Age
and the answer is: NESTEGG
Word Meaning:
NEST EGG — A natural or artificial egg placed in a bird's nest, to encourage the bird to lay its own eggs there.
Definitions from Wiktionary.