Then this ebony bird beguiling my sad fancy into smiling
By the grave and stern decorum of the countenance it wore,

from Edgar Allan Poe – The Raven on Rap Genius

Meaning

With it’s stern and serious expression that the narrator was unable to take seriously, the raven was able to ‘beguille’ or trick the narrator into smiling making him unaware of the bad omen the raven represents

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