Simple past tense and past participle of bellow.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "bellowed" in a sentence
"In July this year, Time magazine published on its cover page the photo of an Afghan woman whose nose was cut off; the title bellowed: 'What happens if we leave Afghanistan.'"
"For a while, I thought my historic rally experience was going to consist entirely of hearing that phrase bellowed over and over by a park police officer."
"The stag bellowed again and turned and ran to the woods."