They accepted the decision 'without a murmur' (of protest/complaint). [=they accepted the decision without protesting/complaining at all]
Her doctor detected a (heart) 'murmur' during a routine physical exam.
“Thank you,” she 'murmured' as she left the room.
(..) What are you testing me for? To see if your gas could be harmful to others. He's just scared. Talk to him. Look, Mr Burski, I heard a systolic murmur in your heart, which is most likely nothing, but if I don't check you out, - I'll worry about you all day. - Then I'll do it. For you. (..)2001 TvShow: Scrubs Title: My First Day Season: 1 Episode 1