名詞 dog-ear:

1. a corner of a page turned down to mark your place

dog-ear

n.（名詞）
A turned-down corner of a page in a book.
書頁的折角
v.tr.（及物動詞）
dog-.eared,dog-.ear.ing,dog-.ears
To turn down the corner of (the page of a book).
把書頁折角
To make worn or shabby from overuse.
用破，用舊：由于使用過多而破損或破舊

【引伸】
dog.-eared.
adj.（形容詞）