櫛の歯が欠けたよう
Meanings
1
full of gaps; missing important things here and there
Describes a state where elements that should be present are missing in a scattered, irregular way, like a comb with missing teeth. Often used figuratively for incomplete collections, attendance, or coverage.
His book collection is full of gaps, with volumes missing from the middle of the series.
The attendance at the meeting was spotty, with many people missing.