A dog ear is a folded down corner of a book page. The name arises from the fact that the ears of many breeds of domestic dog flap over. A dog ear can serve as a bookmark. While generally frowned upon by those that want to preserve books in their original condition, it is particularly common in use on paperbacks which are designed to be cheaper and more harshly used than hardcovers. Sometimes, it is also used to keep sheets of paper together, in the absence of a stapler or paper clip.
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