The phrase "Night after night" help create tension in the passage by "presenting Esther's emotion and inner conflict as ongoing and continuous".
The use of the phrase "night after night" in the passage signifies the ongoing and continuous be activity of Esther. Esther travels to the border of the village alone without anyone's awareness to watch the sun set in the foothills, and the far line of sky and prairie before she returns to her father's lodge.
This is a word or group of words that functions as a single unit in the syntax of a sentence, usually consisting of a head, central word and elaborating words.
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