Hello Marcia,To be the norm:
ser a norma/ regra.
It is something that is usual, typical, or standard.
- This system has been the norm
in Germany for decades.
- Under-representation of women in politics, for example, continues to be the norm
standard, usual, the rule, normal, typical, average, unexceptional, expected.
Reference: http://dicionario.reverso.net/ingles-po ... the%20norm