frighten/scare the hell out of (someone)

informal

to make someone feel very frightened.

He drives like a madman - frightens the hell out of me.

• a short fuse
• a short sharp shock
• a shot across the bow
• a shotgun wedding
• a shot in the arm
• a shot in the dark
• a shoulder to cry on
• a shouting match
• a show-stopper
• a shrinking violet
• aside from
• aside from something
• a siege mentality
• as if own the place
• as if you own the place
• a sight for sore eyes
• a significant other
• a sign of the times
• a sine qua non
• a sinking feeling
• a sinking ship
• a sin tax
• as it comes
• as it stands
• a sitting duck