underlining

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From underline + -ing.

underlining

1. present participle and gerund of underline

underlining (countable and uncountable, plural underlinings)

1. An act or instance of marking text with an underline.

   Synonym: underlineation

   • 2005, Theodore Cheney, Getting the Words Right, page 238:

     There are so many underlinings, so many exclamation points in the margins, and so much highlighting from my many readings and appreciatings that it looks like a case of severe book abuse. It is not; these are marks of love.

From under- + lining.

underlining (plural underlinings)

1. A lining on the inside of a garment.

Not to be confused with underlying.