underpart

Meanings

Plural: underparts

Noun

• a part lying on the lower side or underneath an animal's body
  • "the warbler has a white throat and underparts"
  • "a woodland mouse with white underparts"
• A lower or underneath part.
• A lower or underneath part.
• Such a part of a bird.

Verb

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