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fluff2 [transitive]
1 informal to make a mistake or do something badly [= mess something ↔ up]: 
He fluffed his shot and missed the goal.She fluffed her lines in the first scene.
He fluffed his shot and missed the goal.She fluffed her lines in the first scene.2 also fluff something ↔ up/out to make something soft become larger by shaking it : She fluffed up the pillows for me.
She fluffed up the pillows for me.3 also fluff something ↔ up/out if a bird fluffs its feathers, it raises them and makes itself look bigger
