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notches; serration; indentation; jaggies (stair-step artifacts in computer images)
notched; serrated; jagged; corrugated; milled
ぎざぎざに切れてしまう。
It ends up cutting jaggedly.
缶のふたがぎざぎざで痛いよ。
The can lid is jagged and it hurts.
葉っぱの端がぎざぎざだ。
The leaf edges are jagged.