Crossword Genius

In the unfortunate event that (4)

Ross

I believe the answer is:

lest

(Other definitions for lest that I've seen before include "For fear that (something happens)" , "In order not to, say forget?" , "In case" , "In order not to, to avoid the risk that" , "For fear that (something should happen)" .)

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