In the evening or at eventide, used archaic or poetically to mean 'toward evening' or 'in the evening time.'
From German 'Abend' (evening) plus '-s' suffix, or alternatively Old English/Germanic root 'even-' relating to evening. Used in historical English texts and poetry.
This is essentially a German word doing German grammatical work in English poetry—it's what happens when Romantic poets raided the Germanic side of English's vocabulary for musical, archaic-sounding alternatives to 'evening.'
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