Today's Word of the Day means...
To fail; botch, esp by clumsiness •The older example refers to playing cricket: This is a ripe one. Don't muff it, Billy (1837+)
[verb sense fr the clumsiness of someone wearing a muff on the hands]
in wearing apparel, usually cylindrical covering of fur, fabric, feathers, or other soft material, with open ends into which the hands are placed to keep them warm. Originally a purse and hand warmer in one, the muff was first introduced to women's fashion in 1570, when fur trimming was becoming popular