It’s trial by error

This might be another “freudian slip malaphor” (see “I have nothing to hide but the truth”), when considering it was spoken by a physician.  This is a mash up of “trial by fire” (ability to perform under pressure) and “trial and error” (trying repeatedly for success).  It’s also the title of  a “Murder She Wrote” and  a “Star Trek: Deep Space Nine” episode.  Who knew?   Thanks to Barry Eigen for sending in this gem.