1
- reporting verb say something indistinctly and quietly, making it difficult for others to hear含糊地说话, 咕哝：
with obj. he mumbled something she didn't catch他叽里咕噜地说了些她听不清的话
with direct speech 'Sorry, ' she mumbled.“对不起,"她咕哝着说。
2
- with obj. bite or chew with toothless gums or eat without making much use of the teeth（用无齿的牙床）费力嚼咬, 咬磨。
派生词
mumbler
nounmumblingly
adverb词源
Middle English: frequentative of MUM2.