This is the 13244th most frequent Polish word.
opierać
"Opierać" means "to lean," "to rest," or "to base" depending on the context.
The word 'opierać' here means 'to rely on' or 'base upon' and is used in the context of forming the foundation of an argument or idea.
Opieram się na tej teorii podczas pisania raportu.
I rely on this theory while writing the report.
In this context, 'opierać' means 'to lean against' or 'put weight on' an object for physical support.
On opiera się o ścianę, gdy rozmawia z nami.
He is leaning against the wall while talking to us.
Here, 'opierać się' means 'to resist or oppose' and is used metaphorically to describe opposing an abstract concept like change.