Definition of em rule in English:

em rule

Line breaks: em rule
Pronunciation: /ˈɛm ruːl/

Entry from British & World English dictionary

noun

British
A long dash (—) used in punctuation. Compare with en rule.

Definition of em rule in:

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Word of the day hubris
Pronunciation: ˈ(h)yo͞obris
noun
excessive pride or self-confidence