ˈledˌ ̷ ̷- noun
also lead-pipe
Etymology: lead-pipe from the phrase lead pipe pipe made of lead, from Middle English lede pype, from lede, leed lead + pype, pipe pipe
slang : something very easy or certain
ought to be a lead-pipe cinch to find — Big Detective Cases
if it wasn't him it was you and that's a lead-pipe cinch — Nelson Algren