To make one's hair stand on end; extremely shocking or outrageous.
发指头发竖起来，形容极为愤怒。使人头发都竖起来了。形容使人极度愤怒。
《庄子·盗跖》谒者入通，盗跖闻之大怒，目如明星，发上指冠。”
The corruption in the government was so rampant that it was truly hair-raising.
Learn the next connected idiom: 令人发指 (lìng rén fà zhǐ) → 指日可待 (zhǐ rì kě dài)
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