This is the 2973rd most frequent Polish word.
odbywających
"Participating" or "undergoing," depending on the context.
Used as a participle describing people who are currently participating in a training.
Obserwowałem ludzi odbywających szkolenie.
I watched people undergoing training.
Used as a participle to address individuals currently taking part in a course.
Gratulujemy wszystkim osobom odbywającym kurs.
Congratulations to everyone attending the course.
Used as a descriptive word to specify the action that soldiers were engaged in.