em dash
English
    
    Alternative forms
    
- em rule, emdash, em-dash, m dash, m-rule, mutton dash
Etymology
    
Named for its width, which is equal to the width of the letter m or M, or approximately twice the width of an en dash.
Noun
    
- (typography) The symbol (—) (used to demarcate a parenthetical thought or to indicate a break, or for emphasis)
Usage notes
    
These symbols are often identical in appearance and can be used as quotation dashes:
Translations
    
typographical symbol '—'
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