1
general::
Phrase(s): worm something out of someone
to draw or manipulate information out of someone. • I managed to worm the name of the doctor out of her before she ran off. • You can’t worm the names out of me!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Elicit or make one's way by artful or devious means. For example, He tried to worm the answer out of her, or She can't worm out of this situation. This expression alludes to the sinuous passage of a worm. [Early 1700s]
American Heritage Idioms