1. To give up or to surrender: "The King abnegated his throne to his son."
2. To deny something to oneself; to restrain; especially, from indulging in some pleasure: "The minister of the church abnegated the material luxuries of life."

"When Agnes Marcia became a nun after the death of her son and husband in an auto accident, she was abnegating a life of comfort and ease in order to dedicate her life to God."

"Indulging in an ice cream sundae abnegates the healthful effects of having a salad for lunch."

"Because Lucy wanted to lose weight, she is abnegating the eating of chocolate for an entire month."