keep a low profile
diam
quiet
button one's lip
quieten
hush
mousy
shush
tick a lock
fall silent
choops
out of sight
in hiding
shushy
doggo
hushedly
hushingly
aunt nell
shaddap
quietlike
quiesce
keep one's mouth shut
hushedness
yush
silence
quietly
pipe down
hush one's mouth
shut one's trap
shut one's face
cork it
shut one's gob
shut one's mouth
peep
quieting
sing small
hushen
discreet
hold one's fire
softly softly
hush down
hold one's peace
hushable
bestill
tut
pacifically
keep one's lips sealed
children should be seen and not heard
sotto voce
hushfully