MANCOVA with 2 dummy variables (Question about interaction probing)

#1
Hello!

I am running a MANCOVA with two dichotomous IVs and a 4 continuous DVs for my Master's thesis. When the first edits came back, I was asked to write about post-hoc probings of significant interactions. I am having a hard time understanding how one would "probe" these types of interaction, and how this would offer any additional information compared to the main effects.

Thanks for your help!
 
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