prong UK /pɹɒŋ/US /pɹɔŋ/noun 4verb 1forms 3 noun4 •A thin, pointed, projecting part, as of an antler or a fork or similar tool.a pitchfork with four prongsa comb with prongs •(figurative) A branch; a fork. •(informal, slang) The penis.One look at that lifeguard's prong gave me a throbber like a baseball bat — not quite that big, of course, but at least that hard! — 1977 •A fork (agricultural tool).[…] a tradition is recorded that a man called 'Ralph' resided in this cavern for many years, and, with a prong as his weapon, successively kept the bailiffs at bay. — 1874 verb1 •To pierce or poke with, or as if with, a prong.He uncovered the fragrant eggs and b., and I pronged a moody forkful. — 1926 formspronged · pronging · prongs