Repine is a verb that means to complain or express regret.
The exact origin of our word of the day is unclear, but we can say with certainty that its prefix R-E refers to the past. When we repine something we regret past actions or behavior.
For example: After a while, it gets a little tedious hearing Charlie repine at his past mistakes. We tried to assure him that his decision to not go to clown college would not be his undoing.
