Brain
Brain noun - A very smart person.
Stand in
Stand in verb - To serve as a replacement usually for a time only.
Both terms in one sentence
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In an episode set during the silent film era, Brain, after an attempt to take over the world using movies, stand in front of the projector and laments "There's no way a mouse will ever have an impact on the silver screen".
Source: It Will Never Catch On - Nonoha in Phi Brain: Puzzle of God serves this role as the rest of the main cast are puzzle-solving geniuses, so she gets to stand in for the audience and ask any questions needed about the various puzzles they are confronted with.
Source: The Watson
Cite this Source
Stand in and Brain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/brain/stand_in
Brain & Stand in. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/brain/stand_in>.
Stand in or Brain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/brain/stand_in.
Google Ngram Viewer shows how "brain" and "stand in" have occurred on timeline