fluff

fluff 1

•  noun [U]
• 

1    small light pieces of waste wool, thread etc:
?She picked the fluff off her sweater.
2    soft fur or feathers, especially from a young animal or bird

fluff 2

• verb [T]

1    also fluff up/out to make something soft appear larger by shaking or brushing it:
?a bird fluffing out its feathers
2    informal to make a mistake or do something badly:
?Ricky fluffed the catch and we lost the game.