worst-case scenario
noun [ S ] uk/ˌwɜːst.keɪs sɪˈnɑː.ri.əʊ/ us/ˌwɝːst.keɪs səˈner.i.oʊ/
最坏的可能；最糟的情况
the most unpleasant or serious thing that could happen in a situation
The study concludes that in a worst-case scenario there might be 80,000 cases of the disease. 该研究得出结论，最坏的情况是可能有8万人罹患此病。