murmur against (someone or something)
To mutter, whisper, or grumble in an angry, disgruntled manner about someone or something. We all left the meeting murmuring against the additional hours we'd have to work, but, in the end, what choice did we have? Instead of just murmuring against the boss like you always do, why don't you register a complaint with HR?
murmur against someone or something
to grumble about someone or something. Everyone was murmuring against the manager. The citizens will begin murmuring about the government soon.