Mangle means "to injure with deep disfiguring wounds by cutting, tearing, or crushing"
e.g. Bodies of many tourists have been found in a mangled state in the pacific ocean - thought to be a work of sharks
(This sentence is NOT true, just an example)
Mangle may also mean "to spoil, injure, or make incoherent especially through ineptitude"
e.g. The text was mangled due to careless typesetting