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mazel tov

or ma·zal tov

[mah-zuh l tawv, tawf, tohv]Yiddish.
noun
  1. an expression of congratulations and best wishes, used chiefly by Jews: A chorus of mazel tovs greeted the newlyweds as they circulated from table to table.
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interjection
  1. Congratulations!; Best wishes!: “Mazel tov,” Grandpa said as he thrust a five-dollar bill into my pocket. “I'm so proud of you!”
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Origin of mazel tov

1860–65; < Yiddish mazltov < Hebrew mazzāl tōbh literally, good luck
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for mazel tov

1862, from modern Hebrew mazzal tob "good luck," from Hebrew mazzaloth (plural) "constellations."

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Online Etymology Dictionary, © 2010 Douglas Harper