underbrace

From under- +‎ brace.

• Audio (US):

  (file)

underbrace (third-person singular simple present underbraces, present participle underbracing, simple past and past participle underbraced)

1. (transitive) To brace, fasten, or bind underneath.

underbrace (plural underbraces)

1. The symbol ${\displaystyle \underbrace {} }$.