fluff

US /flʌf/
UK /flʌf/
1.

lông tơ

small, loose pieces of wool or other soft material, or the down (= soft new hairs) on a young animal:

:
He brushed the fluff off his coat.
1.

lông tơ

to fail something or do it badly:

:
I fluffed my driving test three times before I finally got it.