This is the 3064th most frequent Polish word.
popełnił
"Committed" (past tense of "commit").
In this context, 'popełnił' (past tense of 'popełnić') is used to indicate that someone committed or made a mistake, associating it with an action of error.
On popełnił błąd podczas obliczeń.
He made a mistake during the calculations.
Here, 'popełnił' is used in a somewhat figurative sense, suggesting that the artist has produced or committed to a piece of art.
Artysta popełnił dzieło, które zaskoczyło wszystkich.
The artist created a work that surprised everyone.
In this sentence, 'popełnił' expresses the act of committing a grave action, in this case, a milestone or final decision. It is commonly used with heavy or serious topics.