Guard dog’s warning

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it’s A 19 letters crossword puzzle definition.
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Possible Answers: GRR.

Last seen on: USA Today Crossword – Sep 12 2018

Random information on the term “GRR”:

Agroar Carga Aérea was a cargo airline based in Portugal. Having originally been specialized on agricultural aviation, Agroar launched commercial airline business with cargo flights between Lisbon and Funchal, using a Boeing 737-300 jet aircraft, which was owned by Flyant.

Agroar also offered aviation-related services like the launching of paratroopers, firefighting, and sightseeing and event flights, as well as aircraft maintenance.

GRR on Wikipedia