UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈægrəʊ/US:USA pronunciation: respellingUSA pronunciation: respelling(agrō)

WordReference Random House Unabridged Dictionary of American English © 2020
ag•gro  (agrō),USA pronunciation n. [Brit. and Australian Informal.]
  1. British Termsaggressiveness, esp. that of an urban youth gang or gang member.
  2. British Termstrouble;
  • 1965–70; construed as a shortening of either aggravation or aggression (or aggressive); see -o

Collins Concise English Dictionary © HarperCollins Publishers::
aggro /ˈæɡrəʊ/ n
  1. Brit slang aggressive behaviour, esp by youths in a gang
Etymology: 20th Century: from aggravation

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