the time, esp. the Tuesday (Shrove Tuesday: cf. Mardi Gras), just before Ash Wednesday: so called from the custom of preparing for Lent by sacramental confession esp. during this period
Origin of ShrovetideMiddle English schroffetide ; from shriven, to shrive + tide
The three days, Shrove Sunday, Shrove Monday, and Shrove Tuesday, preceding Ash Wednesday.
Origin of ShrovetideMiddle English schroftide : schrof-, shriving (from schriven, to shrive; see shrive) + tid, time; see tide1.