underlining

English

Etymology 1

underline +‎ -ing

Verb

underlining

1. present participle and gerund of underline

Noun

underlining (plural underlinings)

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

Etymology 2

under- +‎ lining

Noun

underlining (plural underlinings)

1. A lining on the inside of a garment.