This phrase is used to illustrate when something doesn't happen in one way, it will certainly happen in another similar way. The literal translation is 'if it's not Juana, it's her sister', meaning if it's not one thing, it's another.
Examples
- Spanish: Si no llueve, hace mucho calor. Como se dice, si no es Juana, es su hermana.
- English: If it's not raining, it's very hot. As they say, if it's not one thing, it's another.