The peak of a process or an activity is the point at which it is at its strongest, most successful, or most fully developed.
例句
The party's membership has fallen from a peak of fifty-thousand after the Second World War...二戰后該黨黨員人數已從5萬人的峰值下降了。The bomb went off in a concrete dustbin at the peak of the morning rush hour.在最繁忙的交通早高峰期，那枚炸彈在一個混凝土垃圾箱里爆炸了。
VERB
達到頂點；達到頂峰；達到最高值
When something peaks, it reaches its highest value or its highest level.
例句
Temperatures have peaked at over thirty degrees Celsius...溫度最高達30攝氏度以上。The crisis peaked in July 1974...那場危機在1974年7月達到巔峰。
ADJ
（水平、價值）最高的，最大的
The peak level or value of something is its highest level or value.
例句
Calls cost 36p (cheap rate) and 48p (peak rate) per minute...電話每分鐘36便士（優惠費率）和48便士（高峰費率）。We bought it at the wrong time and paid the peak price.我們買的時機不合適，買了個最高價。
ADJ
高峰的；高峰期的
Peak times are the times when there is most demand for something or most use of something.
例句
It's always crowded at peak times...高峰期總是非常擁擠。During peak periods, reservations are difficult to make at some of the hotels.在高峰時期，有些酒店很難預訂到房間。
N-COUNT
山峰；山頂；山巔
A peak is a mountain or the top of a mountain.
例句
...the snow-covered peaks.積雪覆蓋的山頂
N-COUNT
帽舌；帽檐
The peak of a cap is the part at the front that sticks out above your eyes.