IPA: /nɒnˈpiːk/
KK: /nɑnˈpik/
Referring to times or periods that are not at the peak or highest level of activity, demand, or usage.
The nonpeak hours at the gym are much quieter than during the evening rush.
Nonpeak → It is formed from "non-" (meaning not) and "peak" (from Old English "pīc", meaning a pointed top or summit). The word "nonpeak" refers to a time or period that is not at the peak or highest point.
Think of 'not' ('non-') being combined with 'peak' to remember that 'nonpeak' refers to a time that is not at the highest point.