Below are possible answers for the crossword clue Period of decline.
3 letter answer(s) to period of decline
EBB
a gradual decline (in size or strength or power or number)
fall away or decline; "The patient's strength ebbed away"
flow back or recede; "the tides ebbed at noon"
hem in fish with stakes and nets so as to prevent them from going back into the sea with the ebb
the outward flow of the tide
6 letter answer(s) to period of decline
SUNSET
atmospheric phenomena accompanying the daily disappearance of the sun
of a declining industry or technology; "sunset industries"
providing for termination; "a program with a sunset provision"
the daily event of the sun sinking below the horizon
the time in the evening at which the sun begins to fall below the horizon
8 letter answer(s) to period of decline
TWILIGHT
a condition of decline following successes; "in the twilight of the empire"
lighted by or as if by twilight; "The dusky night rides down the sky/And ushers in the morn"-Henry Fielding; "the twilight glow of the sky"; "a boat on a twilit river"
the diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth
the time of day immediately following sunset; "he loved the twilight"; "they finished before the fall of night"
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