underlinement

English

Etymology

underline +‎ -ment

Noun

underlinement (uncountable)

1. Underlining.
   • 1967, Medical News Letter, volume 50, numbers 1-12, page 23:

     The underlinement of the word acute is to emphasize the fact that all the data is based on acute effects and the long term or chronic effects, if any, are completely unknown.