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general::
noun ADJ. gathering, thickening TWILIGHT + NOUN world (figurative) the twilight world of the occult | zone (figurative) the twilight zone between living and merely existing | years (figurative) a forgotten man who spent his twilight years alone PREP. at ~, in/into the ~ She walked away into the thickening twilight. PHRASES in the twilight of your career/life
Oxford Collocations Dictionary