BEIJING — China said on Wednesday that U.S. high altitude balloons flew over its Xinjiang and Tibet regions, and it will take measures against U.S. entities that undermine Chinese sovereignty as a diplomatic dispute festered.

Source: https://financialpost.com/pmn/business-pmn/china-sanctions-lockheed-martin-raytheon-over-taiwan-arms-sales-2

Doubt festered in her mind.

Source: https://www.theguardian.com/sport/2023/jun/11/third-roland-garros-win-tennis-iga-swiatek-on-path-to-greatness

Ironically, it was as the public accepted Camilla that Prince Harry’s resentment seemingly festered.

Source: https://metro.co.uk/2023/05/06/how-king-charles-iii-became-a-champion-for-the-underdog-18723314/

There were a few that were broken off so we had to wait until they festered up and got them out a day or two later.

Source: https://www.eptrail.com/2023/08/01/ride-easy-a-dog-and-a-bog/