n.

1. 凹口，凹陷
2. 鋸齒狀
3. （印刷或書寫中的）首行縮排、縮格
4. 【物】壓痕，刻痕

n.

1. the action of indenting or the state of being indented.
2. a deep recess or notch on the edge or surface of something.