one-two punch
noun [ usually S ] US uk/ˌwʌnˈtuː ˌpʌntʃ/ us/ˌwʌnˈtuː ˌpʌntʃ/
祸不单行,雪上加霜
two unpleasant things that happen together
The weather delivered a one-two punch to farmers with unseasonal freezing temperatures and strong winds. 天气反常气温降至冰点以下,又遇上大风,这对农民来说是祸不单行。