This is the 520th most frequent Chinese word.
片
"片" means "slice," "piece," "sheet," or "fragment."
Here, '片' is a measure word indicating a thin, flat piece of something.
一片面包。
A slice of bread.
In this sentence, '片' describes a part of something indistinct, like a cloud in the sky.
天上一片云。
There is a cloud in the sky.
Here, '片' refers to a segment or piece, specifically a leaf in this context.