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em dash - 2 dictionary results

em dash

–noun Printing.
a dash one em long.
em·dash or em dash   (ěm'dāsh')   
n.  A symbol ( — ) used in writing and printing to indicate a break in thought or sentence structure, to introduce a phrase added for emphasis, definition, or explanation, or to separate two clauses.

[From its being the width of an m in printing.]
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