Sentence examples for peak in from inspiring English sources

"peak in" is a correct and usable phrase in written English.
It can be used when describing something or someone at their highest point or level. Example: "The floodwaters are expected to peak in the next few hours before gradually receding." This sentence is describing the floodwaters reaching their highest level before decreasing. Another example: "Her singing career reached its peak in the 1990s, with several number one hits on the charts." This sentence is describing the highest point of her singing career, which was in the 1990s.