expression, noun
having no fear of heights
A somewhat playful or pseudo-medical term for someone who is completely unfazed by heights. Often used in contrast with 高所恐怖症 (acrophobia).
彼は高所平気症だから、高いところでも全然怖がらない。
He has no fear of heights, so he isn't scared at all even in high places.
高所平
For someone with no fear of heights, even skydiving is just fun.