We investigate the chromium breathing-pyrochlore sulfide ${\mathrm{AgInCr}}_4{\mathrm{S}}_8$, a chromium-based thiospinel, by synchrotron x-ray and neutron powder diffraction, dc magnetization, and heat capacity. Diffraction confirms the $F\overline{4}3m$ breathing structure with alternating large and small $\mathrm{C}{\mathrm{r}}_4$ tetrahedra, a large breathing ratio ($d^{\prime }/d=1.106$ at 300 K), and substantial Ag/In intermixing on the $A$ sublattice ($\sim 16\%$). No structural transition or magnetic Bragg peaks are detected down to 1.5 K. An enlarged low-angle difference plot between the 1.5 and 20 K neutron diffraction patterns shows a weak broad diffuselike enhancement, consistent with short-range or frozen correlated moments within the sensitivity of the present data. Susceptibility yields a positive Weiss temperature ${\theta }_{\mathrm{W}}=+92\mathrm{K}$ and a moment enhancement in 30–60 K, while the magnetic entropy released by $\sim 30\mathrm{K}$ approaches a scale of order $R$ ln 13, together consistent with the development of short-range tetrahedral ferromagnetic correlations and an effective $S=6$ cluster-moment picture. A broad susceptibility cusp with ZFC–FC bifurcation and a low-temperature specific-heat anomaly near 9 K indicate a phenomenological glassy-freezing anomaly without long-range order. ${\mathrm{AgInCr}}_4{\mathrm{S}}_8$ provides a benchmark for the interplay of strong breathing distortion and quenched $A$-site disorder in chromium breathing pyrochlores.

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• Frustrated magnetism
• Pyrochlores
• Spinels
• Transition metals
• Magnetization measurements
• Neutron diffraction
• Specific heat measurements
• X-ray powder diffraction