The evening before a holiday, -- from the Jewish mode of reckoning the day as beginning at sunset. not at midnight; as, Christians eve is the evening before Christmas; also, the period immediately preceding some important event.
Every man casts a shadow; not his body only, but his imperfectly mingled spirit. This is his grief. Let him turn which way he will, it falls opposite to the sun; short at noon, long at eve. Did you never see it? Henry David Thoreau
Eve was not taken out of Adam's head to top him, neither out of his feet to be trampled on by him, but out of his side to be equal with him, under his arm to be protected by him, and near his heart to be loved by him. Matthew Henry