gag
bite one's tongue
bite one's lip
silence
save one's breath
save one's breath to cool one's porridge
muzzle
la la la
mouth
mic-check
impulsive speech
mind one's language
white noise
endophasia
shushing
subvocalizer
subvocaliser
discretion is the better part of valour
autospeak
don't get someone started
well
hold one's peace
dumb
discourseless
underspeak
negation
put a sock in it
filter
contradiction
antispeech
wash one's mouth out
objection
umlessness
keep mum
dirty talk
whillywha
pipe down
let me see
freedom of speech
bottle it
mouthing
inarticulate
unarticulate
hypoarticulation
deplatform
hedge
put up or shut up
murmur
talk out of
unspeakingly
nonrhetorical
get off of someone's cloud
er
jump in
spoken
flap one's gums
antiverbal
door opener
scrape
guard one's tongue
immodest
paralipsis
shout out
dialogueless
hemming
declaim
short-spoken
extraverbal
pseudology
spoken pause
rejection
nonsonorant
confutation
bleep out
hocus-pocus
soft shoe
extraverbally
mouth the words
yabble
antiprofanity
revelation
tongue-tied
jabbering
jabber
gestureless
pantomime
cramp someone's style
gabble
counterdiscourse
phonic
disclosure
hypophonia
revealing
speechify