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Besides the traditional strong and electromagnetic decay modes,${\Upsilon}(nS)$ meson can also decay through the weak interactions within thestandard model of elementary particle. With anticipation of copious${\Upsilon}(nS)$ data samples at the running LHC and coming SuperKEKBexperiments, the two-body nonleptonic bottom-changing ${\Upsilon}(nS)$ ${\to}$$B_{c}^{\ast}{\pi}$, $B_{c}^{\ast}K$ decays ($n$ $=$ 1, 2, 3) are investigatedwith perturbative QCD approach firstly. The absolute branching ratios for${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}{\pi}$ and $B_{c}^{\ast}K$ decays areestimated to reach up to about $10^{-10}$ and $10^{-11}$, respectively, whichmight possibly be measured by the future experiments.

The ${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}{\pi}$, $B_{c}^{\ast}K$ decays with perturbative QCD approach