וַיֵּצֵ֥א יִצְחָ֛ק לָשׂ֥וּחַ בַּשָּׂדֶ֖ה לִפְנ֣וֹת עָ֑רֶב
Rivka's neshoma was trapped in the home of Lavan and Besuel -- the tov was mixed in with the ra, as is the nature of things in this world after the cheit of Adam. Yitzchak went out to daven לִפְנ֣וֹת עָ֑רֶב, to ask Hashem to remove a little bit of the תערובת of this world so that the good could come out.
The Alter Rebbe in Torah Or says this idea in different vein, לשוח - he bent down, בשדה, in the field, outside the city, outside holiness, לפנות ערב, to clean out the darkness
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