without a murmur
Without any protest or complaint; in silent compliance. The protesters were arrested without a murmur, and each stepped silently into the police van. I was shocked when I assigned a 10-page paper and my students just sat there without a murmur. Maybe they were still asleep.
(do something) withˌout a ˈmurmur
(do something) without complaining: She paid the extra money for the trip without a murmur.