underwire

From under- +‎ wire.

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• Rhymes: -aɪə(ɹ)

underwire (plural underwires)

1. A semicircular wire placed in a bra to support the breasts.
2. A bra that includes such wires.

underwire (third-person singular simple present underwires, present participle underwiring, simple past and past participle underwired)

1. To fix such a wire in place.