scare the hell out of (you)

to make you feel extremely frightened.

His idea of fun scares the hell out of me.

Related vocabulary: scare the pants off you

• in a pinch
• in a quandary
• in a row
• in a sense
• in a sweat
• in a tight spot
• in a vacuum
• in a way
• in awe
• in awe of
• in awe of someone
• in awe of something
• in a word
• in bad faith
• in bed with
• in bed with someone
• in birthday suit
• in black and white
• in blood
• in brief
• in broad daylight
• in broad strokes
• in cahoots
• in cahoots with
• in cahoots with someone