vt to tarnish, as reputation or character; to defame.
2. blemish ·vt to mark with deformity; to injure or impair, as anything which is well formed, or excellent; to mar, or make defective, either the body or mind.
3. blemish ·noun any mark of deformity or injury, whether physical or moral; anything that diminishes beauty, or renders imperfect that which is otherwise well formed; that which impairs reputation.