This is the 16868th most frequent Polish word.
wymieniał
"Was exchanging" or "mentioned" (past tense of "exchange" or "mention").
In this sentence, 'wymieniał' is used to describe the act of exchanging one item for another, implying a trade or replacement.
On wymieniał stare opony na nowe.
He exchanged the old tires for new ones.
Here, 'wymieniał' refers to the act of sharing or transferring information reciprocally between two parties.
Wymieniał się informacjami z kolegą.
He was exchanging information with his colleague.
In this context, 'wymieniał' is used to indicate the act of verbatim listing or naming items.