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Synonyms
un·der·line (ŭńdər-līń, ŭńdər-līń)

transitive verb: -lined, -lin·ing, -lines. 

  1. To draw a line under; emphasize or cause to stand out; underscore.
  2. To emphasize; stress.

noun 

A line under something, such as a symbol, word, or phrase, used to indicate emphasis or italic type.