Crossword Genius

Sharp increase (5)

Ross

I think it could be either:

Which length description are you looking for?:

4

5

spike

'sharp increase' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for spike that I've seen before include "ear" , "Large nail; lace (drink)" , "Sharp point, nail" , "Decide not to run" , "Sharp point; flower cluster" .)

I've seen this clue in the Universal and The New York Times.
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