also: だいがい
noun
heavy damage; great harm
Refers to serious, large-scale damage or harm, often used in formal or written contexts.
台風が農作物に大害を与えた。
The typhoon caused heavy damage to the crops.
その政策は経済に大害を及ぼす恐れがある。
That policy could cause great harm to the economy.
Compound of 大 (great, large) and 害 (harm, damage). The reading たいがい follows the on'yomi of both characters, while だいがい is a less common variant.