Definition
to convey your viewpoints emphatically, particularly when not solicited to do so
（尤其是未经邀请时）强烈地发表意见
During the meeting, he started to sound off, even though no one had asked him to speak.
在会议期间，他开始大发议论，尽管没有人请他发言。
People often sound off on social media without hesitation.
人们经常在社交媒体上毫不犹豫地发表意见。
The public sounded off vocally against the changes in policy.
公众大声反对政策变更。