Be in
Cooperate
Cooperate verb - To participate or assist in a joint effort to accomplish an end.
Mutual synonyms
Both terms in one sentence
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Apparently they *could* cooperate with other races, they just hate doing it and prefer to be in control.
Source: Aliens Are Bastards - Conspicuously averted in Act of Valor, where during the interrogation scene, Senior Chief shows the captive a video of the captive's family, and then says that if he doesn't cooperate, he'll never see them again, because he'll be in captivity forever.
Source: Fake Kill Scare
Cite this Source
Cooperate and Be in. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/be_in/cooperate
Be in & Cooperate. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/be_in/cooperate>.
Cooperate or Be in. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/be_in/cooperate.
Google Ngram Viewer shows how "be in" and "cooperate" have occurred on timeline