It derives from a Hebrew phrase that
means "good luck." What phrase is it?
Etymology, Etymology, and more Etymology
as well as grammar, usage, euphemism, slang, jargon, semantics (meaning), linguistics, neologism, idiom, word origin, syntax, dialect, lexicon (vocabulary), diction, pidgin, synonym, antonym, homonym, cant, argot, lingo, and redundancy.

The critically-acclaimed board game
MooT
consists of tough questions about the nuances of the English language.
Answer:
mazel tov
The phrase mazel
tov, good luck, derives from the modern Hebrew mazzal tob, good luck, which, in turn, derives from the
ancient Hebrew mazzaloth, constellations.
Perhaps, suggesting that the arrangement of the stars was in someone's
favour.
Please note that these are draft questions for the board game MooT.
If you spot an error or disagree with anything I've said here,
please let me know and I'll fix it.
(the Mootguy)
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