プログレッシブ和英中辞典(第３版)の解説
びょうせい【病勢】
the state of a disease⇒ようだい(容体)
- 翌日病勢が募った
The next day, his condition took a turn for the worse. - その知らせを聞いて彼女の病勢は悪化した
The news aggravated her illness [condition]. - 病勢は一進一退している
His condition fluctuates between better and worse.