Crossword Genius

Terrifying sound rocks church (7)

Ross

I believe the answer is:

screech

'terrifying sound' is the definition.
(I've seen this before)

'rocks church' is the wordplay.
'rocks' becomes 'scree' (I've seen this before).
'church' becomes 'ch' (common abbreviation).
'scree'+'ch'='SCREECH'

(Other definitions for screech that I've seen before include "Raucous sound" , "Squeal" , "Loud harsh cry" , "cry of horror" , "Sudden shrill cry" .)

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