breed specimens of (a plant or animal) by natural processes from the parent stock

try propagating your own houseplants from cuttings

spread and promote (an idea, theory, etc.) widely

the French propagated the idea that the English were drunkards

(with reference to motion, light, sound, etc.) transmit or be transmitted in a particular direction or through a medium

electromagnetic effects can be propagated at a finite velocity only through material substances

a hydraulic fracture is generally expected to propagate in a vertical plane