in private or in secret; behind closed doors

all around; on all sides; everywhere

popular or lowbrow literature and art; originally refers to folk songs from the ancient state of [[楚国|楚國|chu3 guo2]], often contrasted with [[阳春白雪|陽春白雪|yang2 chun1 bai2 xue3]]; also used as a self-deprecating way of referring to one's own work

both parties or sides involved in a matter