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We propose a novel method to probe the global 21-cm background. Thisbackground experiences the integrated Sachs-Wolfe effect (ISW) as the cosmicmicrowave background does. The 21-cm ISW is modulated by the spectral shape ofthe global 21-cm signal, and thus the measure of the 21-cm ISW will be a probeof the evolution of the global signal. With the phase-1 SKA telescope, probingthe global 21-cm background would be feasible with 10000-hour observation,enabling consistency checks with existing measures of the global 21-cm signalby EDGES and SARAS that are conflicting with each other.

Probing the Global 21-cm Signal via the Integrated Sachs-Wolfe Effect on the 21-cm Background