It was a lock cinch

Brian Williams on MSNBC, the Malaphor Network, uttered this one when he was discussing the Trump impeachment.  It is a congruent conflation of “a lock” and “a lead-pipe cinch or cinch”, both meaning a certainty or a task certain to be accomplished.  Maybe a lock cinch is a certain certainty?  A big thanks to Frank King who heard this one and sent it in.