The phrase "primary threat" refers to the most important or main danger or risk in a given situation. It represents the main thing or person that poses the greatest harm or challenge. Full definition
Primary threats in our state include habitat loss and traffic - related highway mortality. (storagetwo.com)
They argue that similar «mainland islands» could be created, where fences keep primary threats away. (conservationmagazine.org)
Another reason for the agreement, announced just days after the close of the legislative session, is that several of the Independent Democrats, also known as the IDC, have been facing primary threats from Democratic challengers who have said they would join with the rest of the Democrats, if elected. (wrvo.org)