noun
A person, place, thing, or idea. In this case, 'holy day' is a noun referring to a day that is considered sacred or set apart for religious observance.
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The holy day of Eid al-Fitr is a significant religious celebration for Muslims.
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I always look forward to the holy day of Christmas because of the festive atmosphere.
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Let's plan a get-together for the holy day of Diwali, it's going to be lit!
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For her, every Sunday is a holy day dedicated to self-care and relaxation.