idiomC2quietlyso that otherpeoplecannothearexactlywhat you are saying:低声地,轻声地Hemutteredsomething under hisbreath.他低声嘀咕着什么。SMART Vocabulary: related words and phrasesSilence & quiet
cricket
cricketsidiom
deafening
deafeningly
hush
inaudibly
keep it downidiom
keepsomethingdown
muffled
muted
quiet
quieten
silent
silently
soundlessly
subdued
trail
trail away/off
unmute
you could have heard a pin dropidiom
See more results ?(Definition ofunder your breathfrom theCambridge Advanced Learner's Dictionary & Thesaurus? Cambridge University Press)
under your breath| American Dictionary
underyourbreath
idiomquietlyso that otherpeoplecannothear:"Let’s go," shemutteredunder herbreath.(Definition ofunder your breathfrom theCambridge Academic Content Dictionary? Cambridge University Press)#https://dictionary.cambridge.org//dictionary/english/under-breath##