Keep
Keep verb - To mark with an appropriate practice, rite, or ceremony.
Pen in
Both terms in one sentence
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Pen-Pen in Neon Genesis Evangelion is officially an experiment from Misato's old job, which she rescued from the labs to keep him as a pet and as a sort-of cure for her loneliness, but he's really just there to lighten the mood.
Cite this Source
Pen in and Keep. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/keep/pen_in
Keep & Pen in. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/keep/pen_in>.
Pen in or Keep. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/keep/pen_in.
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