NIV Every day he walked back and forth near the courtyard of the harem to find out how Esther was and what was happening to her. NIVUK Every day he walked to and fro near the courtyard of the harem to find out how Esther was and what was happening to her. https://www.biblegateway.com/verse/en/Esther%202%3A11 It doesn’t really mean anything different. The archaic fro occurs only in that phrase. It used to be by far the most common way to say that, but no longer is: see this Google N-gram: https://english.stackexchange.com/questions/119500/whats-the-difference-between-to-and-fro-and-back-and-forth -- 【汉文】日本高中汉文课程（中文字幕） https://www.bilibili.com/video/BV18t411X7v8/?spm_id_from=333.788.videocard.4 --

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