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A dome-shaped curve has been typically observed in many superconductors under compression. However, it has recently been found that the Zintl compound TlInTe₂ exhibits a V-shaped phase diagram of superconducting critical temperature (T_c) upon increase in pressure (P). In this work, we have explored the superconducting properties of TlInTe₂ using the Migdal-Eliashberg formalism to shed light on this T_c-P behavior.