Question

The poet says,'Of a day I had rued'. What is the meaning of"rued"?
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Answer 1

Answer:

verb (used with object), rued, ru·ing.

to feel sorrow over; repent of; regret bitterly: to rue the loss of opportunities. to wish that (something) had never been done, taken place, etc.: I rue the day he was born.

Answer 2

Rued means to waste something regret.

Here, he told that he was very sad but after seeing the dust of snow falling from the hemlock tree, his mood was changed suddenly and he saved some part of his day from ruining in sadness.

Hope it will help you : )