Definition of peak verb from the Oxford Advanced American Dictionary

 

peak

 verb
verb
NAmE//pik//
 
[intransitive]Verb Forms present simple I / you / we / they peak
 
he / she / it peaks
 
past simple peaked
 
-ing form peaking
 
 
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to reach the highest point or value Oil production peaked in the early 1980s. Unemployment peaked at 17%. an athlete who peaks (= produces his or her best performance) at just the right time
See the Oxford Advanced Learner's Dictionary entry: peak