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1. Young, enthusiastic people. This company needs an infusion of young blood before it becomes completely irrelevant in today's world.
2. slang A newcomer to some place or situation. I'm sorry, but I'm not going to take orders from some young blood who's only been with the company five minutes.
3. slang A term of address for a young black man. In this usage, the phrase is often written as one word ("youngblood"). Hey youngblood, how's it going?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
If you talk about young blood, you mean new, young people who are brought into an organization to introduce new ideas and energy. The family business was badly in need of young blood. The selectors have gone for some young blood, fielding a side whose average age is just 26. Note: You can also talk about young bloods, meaning the young people in an organisation or doing a particular activity. Floyd proved he can still compete with the young bloods by becoming the oldest winner of the US Open at 43. Compare with new blood.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
fresh/new/young ˈbloodnew members of a group or organization who have fresh ideas, skills, etc. and so make the group more efficient: What this committee really needs is some new blood.
Farlex Partner Idioms Dictionary © Farlex 2017
1. n. a newcomer. We keep young bloods so busy they never have a chance to look out the window.
2. n. a young, black male. (see also blood.) Tell that young blood to beat it.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.