A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.
A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).
Such a day that commemorates a wedding.
Used other than figuratively or idiomatically: see go, fishing.
Unavailable, having taken time off for recreation.
Absentminded.
Crazy; insane.