Question: I am looking for a good antonym for reducing/simplifying equivalent fractions: 'reduce' and 'simplify' both make sense to me when dividing, but I'm struggling to name what it is we do when we multiply a fraction by 2/2, or 7/7, or any of their Unity Sisters! 

Ideas that came to mind: increasing? complexifying?

Answer: 
I thought the standard terminology was ***expanding*** fractions, at least it is in my language.

Some support for this term found by googling:

[Expanding and Reducing Fractions](https://www.wyzant.com/resources/lessons/math/elementary_math/fractions/expanding_and_reducing_fractions)

[Expanding Fractions](http://www.personal-math-online-help.com/expanding-fractions.html)
How about : rescaling the fraction. This could refer to going in either direction.