noun / adjective / verb
peak
PEEK/piːk/
The highest point of a mountain or other raised shape.
A lone climber stands on the mountain's highest snowy peak.

Etymology
A sharp point supplied the image of a projecting summit or mountaintop. That physical top became a figurative highest level, including the maximum of a changing quantity or the moment it occurs.
In context
this is just a bump on the way to the tallest peak in the Rockies, Mount Elbert.
More examples
- Snow covers the peaks even in early summer.
- The roof peaks directly above the front door.
- She beats the egg whites until they form stiff peaks.
Forms
peak · peaks · peaked · peaking