dog-ear (v.)

also dogs-ear, "to use a book so as to leave the corners of the leaves soiled and curled over" (like the ears of a dog), 1650s. Dog's ear (n.) is by 1725. Dog-eared in the general or extended sense of "worn, unkempt" is by 1894.

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Definitions of dog-ear from WordNet

dog-ear (n.)
a corner of a page turned down to mark your place;