What does "cushion" mean in the text below?
Because hunter-gatherer societies do not grow and store crops, there are bound to times of short supply. To survive such occasions, humans can build up a cushion of fat. When there are no shortages, fat continues to build, creating its own health problems.

Question

Answer

Cushion contains a double meaning here:
1) a margin for error or miscalculation, and
2) a soft mass.

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