“Dia sim, dia não”.
English equivalent: “every other day”.
“Experts say that you shouldn’t run every day; every other day is enough”.
“I wash my hair every other day, otherwise it gets oily”.
Notice that the expression “every other” can be combined with other periods of time to express the meaning of “each alternate”:
“The Arts Bienal takes place in São Paulo every other year“.
“My car is quite economical: I just have to fill it up every other week“.
“My teacher is such a pain! She gives us a pop quiz every other class!”