Use 'die away' when describing fading sounds, lights, or feelings, often to create atmospheric imagery. After the concert, the cheers of the crowd slowly died away.
Pro Tip 2/3
Gradual Process
'Die away' suggests a slow, natural reduction, not an abrupt end. The echoes in the valley died away as night fell.
Pro Tip 3/3
Emotional Fading
Can be used metaphorically for feelings that lessen over time. Her enthusiasm for the project died away after repeated setbacks.