But once
Back when and but once are semantically related in in the past topic. In some cases you can use "Back when" instead an adverb phrase "But once".
Back when
But once and back when are semantically related in in the past topic. Sometimes you can use "But once" instead an adverb phrase "Back when".
Mutual synonyms
Cite this Source
Back when and But once. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/but_once/back_when
But once & Back when. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/but_once/back_when>.
Back when or But once. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/but_once/back_when.
Google Ngram Viewer shows how "but once" and "back when" have occurred on timeline