'To bob at an apple' definitions:

Definition of 'To bob at an apple'

From: GCIDE

Bob \Bob\, v. i.
1. To have a short, jerking motion; to play to and fro, or up and down; to play loosely against anything. "Bobbing and courtesying." --Thackeray. [1913 Webster]
2. To angle with a bob. See Bob, n., 2 & 3. [1913 Webster]
He ne'er had learned the art to bob For anything but eels. --Saxe. [1913 Webster]
To bob at an apple, cherry, etc. to attempt to bite or seize with the mouth an apple, cherry, or other round fruit, while it is swinging from a string or floating in a tug of water. [1913 Webster]