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auto-antonyms
here are the ones I think are the best that I found:

BOLT: run away / secure
BUCKLE: to pull together / to fall apart.
CLEAVE: to cut apart / to cling together.
CUSTOM: ordinary / special
PIT: a solid core / a hole.
ROOT: to establish / to remove entirely (usually used with "out")
SCREEN: to show / to hide
STRIKE: to miss / to hit

I found this quote here:

"Autoantonymy seems, in fact, to be the inherent tendency of words. Spinoza said that every determination is a negation, and to this extent the very use of a determinate word with a determinate meaning requires that one also implicitly say: this is not that. But to say what something is not is already to mention that other thing, and so to associate the thing you are mentioning with its opposite. This, I think, is the genealogy of autoantonyms."

So one word, contrary meanings. not one meaning or the other, but both at the same time. the meanings exist together in the word at once even if the meanings are not used simultaneously.


Sources:
http://people.sc.fsu.edu/~jburkardt/fun/wordplay/autoanto.html
http://www-personal.umich.edu/~cellis/antagonym.html
http://en.wikipedia.org/wiki/Auto-antonym
http://stason.org/TULARC/self-growth/puzzles/302-language-english-synonyms-contranym-p.html
http://www.jimwegryn.com/Words/Antagonyms.htm