This is the 8417th most frequent Polish word.
podkreślał
"Podkreślał" means "emphasized" or "underlined" in English.
Here, "podkreślał" is used to mean "emphasized," indicating that Jan highlighted the importance of a particular activity.
Jan podkreślał znaczenie regularnego czytania książek.
Jan emphasized the importance of regularly reading books.
In this case, "podkreślał" again means "emphasized," referring to the teacher stressing a specific aspect in teaching.
Nauczyciel podkreślał poprawne użycie gramatyki w wypracowaniach.
The teacher emphasized the correct use of grammar in essays.
Here, "podkreślał" conveys that the artist intentionally drew attention to specific aspects of visual art.