Shrove Tuesday, as it was explained:

The day before the beginning of Lent is known as Shrove Tuesday. To shrive someone, in old-fashioned English (he shrives, he shrove, he has shriven or he shrives, he shrived, he has shrived), is to hear his acknowledgement of his sins, to assure him of God’s forgiveness, and to give him appropriate spiritual advice. The term survives today in ordinary usage in the expression “short shrift”. To give someone short shrift is to pay very little attention to his excuses or problems. The longer expression is, “to give him short shrift and a long rope,” which formerly meant to hang a criminal with a minimum of delay.

[The Rev. Ron Lau, Vicar of Christ Church, Cobble Hill, Brooklyn, NY]