soothe
pour oil on troubled waters
hose down
salve
unruffle
placify
assuage
sugarcoat the pill
calmen
quieten down
quiet down
untranquilize
placate
keep one's head
keep one's shirt on
calm
fuss over
encalm
anchor
piss in someone's cornflakes
make friendly
compose
smooth someone's feathers
settle
sile
keep one's knickers on
conciliate
peacen
defreak
relax
keep one's hair on
get ahold of oneself
gentle
get on someone's bad side
allay
get off one's chest
help
kill with kindness
put at ease
tiptoe around
work over
settle someone's hash
sarpork
have one's wits about one
annoy
give someone the shits
quiet
still
clutch one's pearls
relieve