A pitch that the catcher should have caught but did not; allows a base runner to advance a base WordNet 3.0 & Open English WordNet

In baseball, a catcher is charged with a passed ball when he fails to hold or control a legally pitched ball that, with ordinary effort, should have been maintained under his control, and, as a result of this loss of control, the batter or a runner on base advances. Wikipedia

Baseball event resulting in offense advancement due to errant catching Wikidata

A play where the catcher fails to stop a normally playable pitch and a runner advances. Wiktionary