peaks and valleys

: a pointed or projecting part of a garment

: promontory

: a sharp or pointed end

: to reach a maximum (as of capacity, value, or activity)

: to cause to come to a peak, point, or maximum

: being at or reaching the maximum

: to grow thin or sickly

: to dwindle away

: to set (a gaff, a yard, etc.) nearer the perpendicular

: to hold (oars) with blades well raised

: an elongate depression of the earth's surface usually between ranges of hills or mountains

: an area drained by a river and its tributaries

: a low point or condition