What is another word for highwater mark?
Pronunciation: [hˈa͡ɪwɔːtə mˈɑːk] (IPA) 
Highwater mark is a term that is used to describe the highest point reached by a particular phenomenon or occurrence, such as a flood or a financial market. There are a number of synonyms for this term, including the peak, the apex, the summit, the pinnacle, the zenith, and the acme. Each of these terms can be used to describe the same basic concept, but may have slightly different connotations or meanings depending on the context. For example, the term summit may be used to describe the highest point of a mountain, while the term acme may be used to describe the highest point of achievement for a particular person or organization.
