ACUMINATE + NOUN
despair, teeth
adj
Tapering to a point; pointed.
acuminate leaves, teeth, etc.
Tapering to a long point in concave manner at its apex.
verb
To render sharp or keen; to sharpen.
September 17, 1784, William Cowper, letter to the Rev. John Newton To acuminate even despair.
To end in or come to a sharp point.