A dream that you or someone else is dying can represent:
A feeling of low "life energy" or a
weariness in your life, perhaps due to an emotionally or mentally sapping situation, a physical condition that makes you
tired, etc.
Coming to the end of a phase, such as of childhood
The idea of "dying" mentally, emotionally, or spiritual, such as due to lack of nurturing, inspiration, or fulfillment
Possible dream symbol meanings in the dream dictionary are suggested. No "standard meanings" exist because dream meaning is subjective and specific to the dreamer.