a piece of cloth, plastic, or paper that covers the chest and is often tied under the chin of a child to protect the clothing while the child is eating.

any similar cloth or part of a garment.

the front part of an apron, overalls, or similar protective garment above the waist.

Fencing . a piece of canvas attached to the base of the mask, for protecting the throat.

bibcock.

Archaic . to tipple; drink. ?

put or stick one's bib in

Australian Informal . to interfere.