antagonym
noun
an·tag·o·nym
| \ an-ˈta-gə-ˌnim
\
\
plural antagonyms
Definition of antagonym
: contronym
… I think you've discovered a new antagonym … —a word with two opposite meanings. More familiar examples of antagonyms are cleave, which can mean either “cut apart” or “stick together”; and fast, as in “run fast” versus “hold fast.” — Barbara Wallraff, Times Union (Albany, New York), 18 Nov. 2007
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