Horrifying, terrifying (13)

I believe the answer is:

bloodcurdling

I believe this is a double definition.

'horrifying' is the first definition.
(I've seen this before)

'terrifying' is the second definition.
(thesaurus)

(Other definitions for bloodcurdling that I've seen before include "Truly horrifying" , "Arousing horror" , "Terrifying (threats)" , "Scary" , "Causing horror" .)

I've seen this clue in The Times.

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