I'm assuming you don't know what the term means in general, not specific to beej71's comment Flipped classroom = instructional approach in which "lectures" are

I'm assuming you don't know what the term means in general, not specific to beej71's comment Flipped classroom = instructional approach in which "lectures" are pre-recorded and watched by students and home, while class time is used for discussions and solving problems (individually or in groups). The term flipped is used because what you do "homework" in class, and watch "class lectures" at home. See https://en.wikipedia.org/wiki/Flipped_classroom https://en.wikipedia.org/wiki/Flipped_classroom