Meanings
The appearance of a lot of things lined up or packed in a single surface without any gaps.
Examples
・The insects, covered with hair, are too disgusting to touch.
毛でびっしり覆われた虫は、気持ち悪くて触れない。
・My daughter’s notebook was filled up with kanji characters she had just learned.
娘のノートには、学んだばかりの漢字がびっしり書き込まれていた。
Dogmatic Opinion
The image of the same size, but in a high density.
The image of a line on a flat surface. Not used to describe people.
毛は皮膚という平面上にあり、字も紙という平面上にある。
The expression “Bisshiri（packed） with appointments” also evokes the image of a schedule book with appointments written on it.
In this respect, “Gisshiri”, “Gicchiri” give the impression of 3D-like depth.
Proximate Expression
closely/tightly lined/packed/crowded/jammed without any space
