if animals breed, they mate in order to have babies:
Eagles breed during the cooler months of the year.
to keep animals or plants in order to produce babies or new plants, especially ones with particular qualities: ➔ crossbreed1, purebred, thoroughbred
These dogs were originally bred in Scotland to round up sheep.
to cause a particular feeling or condition:
Poor living conditions breed violence and despair.
if a place, situation, or thing breeds a particular type of person, it produces that type:
Society's obsession with sex has bred a generation of unhappy children.