havoc Definition

havoc
noun

1. Great destruction or damage.

Thesaurus: carnage, destruction, devastation, ruin, plunder, despoliation.
2. colloq
Chaos; confusion.
Thesaurus: chaos, confusion, mayhem, uproar.

Idiom: cry havoc

archaic
To give the signal for pillage and destruction.

Idiom: play havoc with something

To cause a great deal of damage or confusion to it.

Etymology: 15c: from French havot plunder.