verderben

Etymology
From a merger of (strong verb) and  (weak verb). The former is from, inherited from , which is in turn from.

Verb

 * 1)  to deprive (someone) of (something); to rob (someone) of (some feeling)
 * 2)  to ruin; to render (something) useless; to corrupt; to spoil
 * 3)  to spoil; to rot; to perish
 * 4)  to be offensive; to live sinfully

Usage notes
In most contexts, the verb has strong conjugation. However, it has weak conjugation when referring to a written document: Der Text ist  – The text is corrupted. (Chiefly, only the past participle is used in this sense.) Also, in archaic German, verderbt could be used in other senses as well.