terrorise
terrorize
terrify
harrow
menace
give someone the shits
monster
clear the air
scare the hell out of
do someone a frighten
make someone's hair stand on end
threaten
scare the shit out of
hagride
frighten the piss out of
flay
put the wind up
curl someone's hair
have the wind up
shirtfront
assault
descend
set up someone's birse
bearbait
wrack
worry
put the fear of God into
enturbulate
mau-mau
freak out
hold over
demonify
vituperate
rain fire and brimstone
set upon
bait
screw around
sicken
malice
dastardize
savage
cow
frighten the life out of someone
scarecrow
scare someone to death
intimidate
come at
bite someone's head off
eat someone's heart
outhorror