ruffle

Concise Oxford English Dictionary © 2008 Oxford University Press:
ruffle/ˈrʌfl/

▶verb

• 1 make or become disarranged; disrupt the smooth surface of.

  ■ (of a bird) erect (its feathers) in anger or display.

• 2 upset the composure of.

• 3 (usu. as adj. ruffled) ornament with or gather into a frill.

▶noun

• 1 an ornamental gathered frill on a garment.

• 2 a low continuous drum beat.

– origin ME: of unknown origin.