It is possible (and common when explaining multiplication) to express multiplication of positive integers as repeated addition like this:
$$4\cdot5 = 5+5+5+5=20$$
And a general expression would be this:
Is the reverse possible? Is it possible to express addition of positive integers as repeated multiplication?
Edit: This question is not a duplicate of How to define addition through multiplication? because my question does not put as strong limitations on what repeated multiplication means. A trivial answer would be $1\cdot(a+b)$, but is not so interesting. I found @barakmanos answer interesting enough.