holy terror
Concise Oxford English Dictionary © 2008 Oxford University Press:
terror/ˈterə(r)/
▶noun
- 1 extreme fear.
■ the use of terror to intimidate people.
■ a cause of terror.
■ (the Terror) the period of the French Revolution when the ruling Jacobin faction ruthlessly executed anyone considered a threat to their regime.
- 2 (also holy terror) informal a person causing trouble or annoyance.
– origin ME: from OFr. terrour, from L. terror, from terrere ‘frighten’.
'holy terror' also found in these Oxford entries:

