1. an act that goes against religious or moral law
2. something that is considered wrong or immoral
Usage: informal

1. to commit a sin; to do something wrong or immoral

Examples

• Many religions teach that lying is a sin.
• He confessed his sins to the priest.
• It’s a sin to waste so much food when people are hungry.
• She believed she had sinned by breaking her promise.
• The community forgave him for his past sins.
• They felt they were sinning against their beliefs.
• What a sin that such a beautiful building was demolished!