Subsisting marriage refers to a marriage that is still in existence and has not been legally dissolved or annulled. It is not typically considered a restriction of marriage, but rather a legal status that must be taken into consideration when entering into a new marriage. In some jurisdictions, entering into a new marriage while still legally married to another person is considered bigamy and is illegal. It is important to be aware of and comply with the laws regarding subsisting marriages in order to avoid legal complications.