Analysis of information sources in references of the Wikipedia article "Holy Wednesday" in English language version.
From Wednesday onward, Judas secretly watched for a chance to turn Jesus over to the chief priests, and so many Christians labeled this day as "Spy Wednesday." In the same vein various cultures reflected the somber mood of this day by calling it "Black Wednesday" or "Wednesday of Shadows," which also corresponds to the liturgical rite of Tenebrae that is celebrated on this day.
Spy Wednesday, so called in allusion to the betrayal of Christ by Judas, or the day on which he made the bargain to deliver Him into the hands of His enemies for thirty pieces of silver.
Spy Wednesday n. in Irish use, the Wednesday before Easter.