also: ぴっしり
adverb, adverb taking the 'to' particle
closely packed; tightly; densely
Describes things being packed tightly together with little or no space between them, such as a schedule, writing, or physical objects.
今日の予定はびっしり詰まっている。
Today's schedule is packed tight.
ノートにびっしりと文字が書いてある。
The notebook is densely filled with writing.
adverb, adverb taking the 'to' particle
thoroughly; sufficiently; without a break
Used for working or doing something continuously and thoroughly, often implying a full or intense effort.
朝から晩までびっしり働いた。
I worked solidly from morning till night.