事情达到紧要关头,需要当机立断
bring sth to a head
(使)事情达到紧要关头,需要当机立断
if you bring a situation to a head or if a situation comes to a head, you are forced to deal with it quickly because it suddenly becomes very bad
释义来自《牛津高阶英汉双解词典》第 9 版