With 40-Across, what's fatefully "cast" in a quote attributed to Julius Caesar [German] (3)

I believe the answer is:

the

(Other definitions for the that I've seen before include "Article is quite definite" , "Born - - - - - - - - (carol)" , "Base of ever-expanding nursery rhyme" , "15, 16 One given taste of own medicine" , "Finis" .)

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

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