catachresis

n. misuse of words; stretching a metaphor, using a word inaccurately in a metaphorical way

Catachresis (from Greek ), which literally means the incorrect or improper use of a word -- such as using the word decimate (e.g., "they were severely decimated") mistakenly for devastated -- is a term used to denote the (usually intentional) use of any figure of speech that flagrantly violates the norms of a language community. Compare malapropism.
See more at Wikipedia.org...

Noun
1. strained or paradoxical use of words either in error (as `blatant' to mean `flagrant') or deliberately (as in a mixed metaphor: `blind mouths')
(hypernym) rhetorical device

(n.)
A figure by which one word is wrongly put for another, or by which a word is wrested from its true signification; as, "To take arms against a sea of troubles". Shak. "Her voice was but the shadow of a sound." Young.
  

to misuse or strain the use of words