muzzle
gag
bite one's tongue
bite one's lip
ostracise
ostracize
silence
button
filter
say it, don't spray it
stop talking
bumble
stammer
stutter
falter
outtalk
mum
mutter
maunder
mussitate
hold one's tongue
mumble
silently
wordlessly
denounce
er
mutely
spoken pause
taciturnly
umlessness
keep mum
mince words
save one's breath to cool one's porridge
bark
wait
unspeakingly
lispy
save one's breath
cone of silence
hold one's peace
discretion is the better part of valour
argue round and round
monologue
talk down
unmentionable
antiverbal
antisag
hypoarticulation
antiprofanity
exeleutherostomize
extraverbal
spoked
extraverbally
don't get someone started
watch one's language
mind one's language
dry up
volubly
whillywha
aphesis
swallow
tongue-tie
chattily
bredouillement
hyperphasia
drone on
sing small
chat
drone
lalophobia
hedge
send packing
antiphrastical
send away
inarticulate
frog in one's throat
drop
unarticulate
slur
nondenunciation
dismiss
button it
break in
bar off
mouth
glossophobia
jargoning
dummy up
unarguing
antispeech
talkless
titubancy
a closed mouth catches no flies
bat away
unconversational
nonconversational