This is the 16470th most frequent Korean word.
빼곡하게
"Tightly packed" or "densely filled."
The word '빼곡하게' is used to describe the state of densely-packed books within the bookshelf.
책장에 책들이 빼곡하게 꽂혀 있다.
Books are densely placed on the bookshelf.
'빼곡하게' here characterizes the thorough and tight spacing of the notes written.
노트에 필기가 빼곡하게 적혀 있었다.
Notes were densely written in the notebook.
This usage illustrates the crowded arrangement of people on the street using '빼곡하게'.