Back when
Since and back when are semantically related. in in the past topic. In some cases you can use "Since" instead an adverb phrase "Back when".
Since
Mutual synonyms
Both terms in one sentence
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When asked, Mikazuki admits that the Crow hasn't spoken ever since he made his wish and sealed their pact, back when Mikazuki was backpacking in India long before he showed up in the manga.
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Sigma's ARMs were blown off in the VLR timeline, and since this is the Sigma who came back when Sigma in VLR was drawn forward, this Sigma is OLD.
Source: Visual Novel / Zero Time Dilemma -
Some viewers believe that she gleefully swan-dived over the line back when she mind-controlled Tavros into jumping off a cliff and has only gone deeper since then, and some viewers think that she can still be redeemed.
Source: Moral Event Horizon / Web Comics
Cite this Source
Since and Back when. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/back_when/since
Back when & Since. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/back_when/since>.
Since or Back when. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/back_when/since.
Google Ngram Viewer shows how "back when" and "since" have occurred on timeline