new guard
noun
variants or less commonly New Guard
1
: the members of an organization (such as a political party) who are newer or younger and who often favor change
Justin Trudeau won the Liberal crown with a crushing victory that brings a new guard to the helm of the party …
Daniel Leblanc
Daniel Leblanc… announced four new executive hires, the beginning of the company's new guard … Ashley Stewart
Ashley Stewart2
: a group of persons who have recently gained prominence or power in a particular field
the new guard of the fashion industry
compare old guard 
Word History
First Known Use
1948, in the meaning defined at sense 1
- acid chloride
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- Acid Green B
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- acid sodium carbonate