Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A lower part or a portion of a lower part or underside, especially of an animal's body: We recognized the robin by its reddish underparts.
  • n. A subordinate role, as in a play.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A lower or underneath part

from the GNU version of the Collaborative International Dictionary of English

  • n. A subordinate part.

from The Century Dictionary and Cyclopedia

  • To divide (a part) and assign subordinate portions of it.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a part lying on the lower side or underneath an animal's body

Etymologies

under- +‎ part (Wiktionary)

Examples

  • There hung the white phone, held in place and the receiver prevented from falling by a wide U-shaped copper band fastened between two sides of the underpart of the table; near it was fastened a small metal box from which a pair of thin wires ran down the inside of the table leg.

    Time and Again

  • The underpart of the pulpit was faced by latticed panels inset between the legs, the whole thing stained and polished to the shade generally known as “a burnished hue.”

    Drowned Hopes

  • The sergeant pulled out a chair and instructed me to bend over it from behind and hold myself down by clasping the underpart of the chair with my hands.

    Children of Resistence

  • De Gier was going to tell her the price when the wind caught the underpart of their canvas roof and pushed it straight up.

    Death of a Hawker

  • He used a small screwdriver to work on the underpart of the front hood — the luggage compartment lid.

    The Luxembourg Run

  • These white, fluffy, downlike feathers grow on the lower underpart of the body of the Maribou Stork.

    The Bird Study Book

  • He then trained some large and ferocious hounds, at a certain signal, to dash in under the model and fix their teeth in its leathern underpart.

    Sea-Wolves of the Mediterranean

  • And now I saw that there did seem to be a mighty long rock laid across the topmost part of the upstanding rock, and yet had a very strange and shapely appearance; and did seem upon the underpart to be as that I had lookt before upon it.

    The Night Land: Chapter 9

  • Mrs.B. will be glad to act an underpart in such an excellent design ....

    Juniper Hall: A Rendezvous of Certain Illustrious Personages during the French Revolution, Including Alexandre D'Arblay and Fanny Burney

  • The kitchen seemed full of the presence of the long-dead woman whom Tony was still grieving for in some underpart of his mind.

    A Poor Man's House

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