Definition of garbles:
(v) :
To corrupt; to make unreadable, incomprehensible, or unintelligible.
(n) :
Confused or unintelligible speech.
(v) :
To pick out such parts (of a text) as may serve a purpose not intended by the original author; to mutilate; to pervert.
(v) :
To make false by mutilation or addition. [from 17th c.]
(v) :
(obsolete) To sift or bolt; to separate the fine or valuable parts of (something) from the coarse and useless parts, or from dross or dirt. [14th–19th c.]
(n) :
(obsolete) Refuse; rubbish.