hose down
soothe
pour oil on troubled waters
sort oneself out
unruffle
placify
encalm
take a breath
chillax
relax
slow one's roll
sile
salve
defreak
get ahold of oneself
untranquilize
keep one's shirt on
still
lay chilly
allay
calmen
keep one's head
anchor
keep one's hair on
compose
conciliate
melt
kayo
placate
sugarcoat the pill
keep one's knickers on
smooth someone's feathers
quieten down
quiet down
subside
relieve
calm
get off one's chest
settle
chill out
put someone in their place
annoy
assuage
put at ease
keep one's cool
drop someone in it
appease
reprieve
remit
keep one's countenance
smooth
gentle
recompose
have one's wits about one
foreclose
tame
bestill
do cheetah flips
get out of someone's face
peacen
whinny
let go