noun
peak; highest point; busiest or most intense point
Used for the highest, maximum, or most intense point of a quantity, activity, season, popularity, traffic, and similar things. Common in phrases such as ピークを迎える and ピークに達する.
売り上げは夏にピークを迎える。
Sales reach their peak in summer.
渋滞のピークは午後五時ごろ
The peak of the traffic congestion is around five in the afternoon.