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notches; serration; indentation; jaggies (stair-step artifacts in computer images)
notched; serrated; jagged; corrugated; milled
「刻刻」 has another reading with different meanings.
紙の端が刻刻になった。
The edge of the paper became jagged.
ナイフの刃がぎざぎざになった。
The knife blade got jagged.
刻刻のはさみで切ってみて。
Try cutting with pinking shears.