Spine-tingling sign of things to come (4)

I believe the answer is:

omen

(Other definitions for omen that I've seen before include "Augur" , "Straw in the wind" , "Event regarded as a prophetic sign of good or evil" , "Portent of evil" , "Harbinger, prophetic sign" .)

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

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