"Beware the ____ of March" (4)

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "mid-month for the Romans" , "date for 21 [ROMAN]?" , "For example, March 15 in the Roman calendar" , "Caesar's fateful days" , "For Romans, a day" .)

I've seen this clue in The Star Tribune, the USA Today, The Washington Post and the Universal.

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