underbar

under- +‎ bar

underbar (plural underbars)

1. A bar placed under a symbol.

   ${\displaystyle {\underline {A}}}$ is the letter A with an underbar.

underbar (third-person singular simple present underbars, present participle underbarring, simple past and past participle underbarred)

1. (transitive) To place a bar under (a symbol).

• errabund, unbarred

Compare Dutch wonderbaar, German wunderbar and Low German wunnerbor.

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underbar

1. wonderful, marvelous

• beundrar