fade out
To slowly disappear; to wither away.
ADV
fast, quickly, rapidly
The old photograph's colors faded rapidly over the years in the sunlight.
gradually, slowly
quietly
The old theater gradually faded quietly from memory as newer cinemas opened downtown.
away
VERB + FADE
begin to
seem to
As the years passed, my childhood memories seemed to fade away completely.
PREP
from
The old photograph's colors gradually faded from bright blue to pale gray.
into
The old photograph gradually faded into shades of brown and yellow over the years.