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young blood

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noun
  1. youthful people.
  2. fresh new ideas, practices, etc.; vigor.

Origin of young blood

First recorded in 1620–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for young blood

young blood

noun
  1. young, fresh, or vigorous new people, ideas, attitudes, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012