We study the interplay between electronic correlations and hybridization in the low-energy electronic structure of CaMn\documentclass[12pt]{minimal}
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				\begin{document}$$_2$$\end{document}2Bi\documentclass[12pt]{minimal}
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				\begin{document}$$_2$$\end{document}2, a candidate hybridization-gap semiconductor. By employing a DFT+Uapproach we find both the antiferromagnetic Néel order and band gap in good agreement with the corresponding experimental values. Under hydrostatic pressure, we find a crossover from hybridization gap to charge-transfer insulting physics due to the delicate balance of hybridization and correlations. Increasing the pressure above\documentclass[12pt]{minimal}
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				\begin{document}$$P_c=4$$\end{document}Pc=4GPa we find a simultaneous pressure-induced volume collapse, plane-to-chain, insulator to metal transition. Finally, we have also analyzed the topology in the antiferromagnetic CaMn\documentclass[12pt]{minimal}
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				\begin{document}$$_2$$\end{document}2Bi\documentclass[12pt]{minimal}
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				\begin{document}$$_2$$\end{document}2for all pressures studied.