Common Meanings
1
nì溺
to drown; to be submerged in water resulting in death
夏季游泳需注意安全，谨防溺水。
Be careful when swimming in summer to prevent drowning.
To spoil, indulge excessively; to be deeply immersed or addicted to.
父母不应该溺爱孩子。
Parents should not spoil their children.
2
niào溺
Refers to urine or the act of urinating, interchangeable with '尿' (niào). This usage is less common in contemporary Mandarin.
动物园里，有只小动物在角落里溺了一泡
In the zoo, a small animal urinated in the corner.