so mush as -  used after a negative word ( such as not or contraction of not ) to stress the smallness of an amount or effort  甚至 （用在否定词后，强调数量之少或事情之小）We didn't hear so mush as a word from her the whole time. [ = we didn't hear a word from her ]自始至终，我们甚至都没听到她说一个字。Not only did they not help, they didn't  so mush as [ = even ] offer to help ! 他们不仅没帮忙，甚至都没表示要帮忙。They ended their date without  so mush as a hug. 约会结束时，他们甚至连个拥抱都没有。（摘自《韦氏高阶英汉双解词典》p.1986）

      下面句子中的 so much as 也属于这种用法  （so much as  用在否定词 never 后面）：

      Until this evening，I had never so much as exchanged a word with him. 在今天晚上之前，我甚至连一句话都未跟他说过。