On the ___ (at a turning point) (4)

I believe the answer is:

cusp

(Other definitions for cusp that I've seen before include "Point of transition, brink" , "Point where two arcs intersect arcs" , "Pointed meeting of curves" , "Prominence on a tooth" , "Point where two curves meet - point of transition" .)

I've seen this clue in the Universal.

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