peak

noun

1
a brim that projects to the front to shade the eyes
he pulled down the bill of his cap and trudged ahead
2
the top or extreme point of something (usually a mountain or hill)
the view from the peak was magnificent
they clambered to the tip of Monadnock
3
the highest point (of something)
at the peak of the pyramid
4
the most extreme possible amount or value
voltage peak
5
a V shape
the cannibal's teeth were filed to sharp points
6
the highest level or degree attainable; the highest stage of development
his landscapes were deemed the acme of beauty
the artist's gifts are at their acme
7
the period of greatest prosperity or productivity

1
to reach the highest point; attain maximum intensity, activity
That wild, speculative spirit peaked in 1929
Bids for the painting topped out at $50 million

Also useful for “peak”:Scrabble— High-value letters — see what it scores