pigeon breasted

/ˈpɪdʒən ˌbrɛstɪd/
adjective
  1. Having a chest that sticks out more than usual, often because of a medical condition where the breastbone is pushed forward.
    • Some birds, like the pouter pigeon, are naturally pigeon-breasted as part of their breed.
    • He was self-conscious about being pigeon-breasted, but his friends never mentioned it.
    • The doctor explained that the child was pigeon-breasted but would not need surgery.