2if something destroys someone, it ruins their life completely:
The scandal destroyed Simmons and ended his political career.
3informalto defeat an opponent easily:
The Bears destroyed the Detroit Lions 35-3.
4HBAto kill an animal, especially because it is ill or dangerous:
One of the bulls had to be destroyed.
WORD CHOICE: WORD CHOICE: destroy, ruin, spoilDestroy means to damage something so badly that it no longer exists or people can no longer use it• The earthquake destroyed even the tallest buildings. • The rainforests are being destroyed at a frightening rate.If you ruin or spoil something, it still exists, but it has lost all its good qualities or features. Ruin is stronger than spoil• The rain ruined my hair. • I don't want to spoil your day.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.