The 'peak' group
These nouns refer to the highest level or greatest intensity that something reaches.
at fever pitch at its height /at the height of ... at its peak /at the peak of ... at its zenith /at the zenith of ...
The eight-year-old twins were at fever pitch from the moment they woke at seven.
In the early 1980s, when unemployment was at its height, few teenagers here could be too choosy about jobs.
Gardner quit boxing at the peak of his career in 1981 after winning the European and Commonwealth titles.