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of one's life

Being the greatest, worst, or best occasion of a lifetime, as in She was having the time of her life at the party, or The threatened takeover of the company put the president in the fight of his life.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.