bobble

Concise Oxford English Dictionary © 2008 Oxford University Press:
bobble1

▶noun a small ball made of strands of wool, as used as a decoration on a hat or as forming on the surface of knitted fabric.

■ (bobbles) small plastic balls attached to elastic, used for fastening girls' hair.

– derivatives
bobbly adjective.

– origin 1920s: dimin. of bob2.

Concise Oxford English Dictionary © 2008 Oxford University Press:
bobble2 informal

▶verb

• 1 move with an irregular bouncing motion.

• 2 N. Amer. mishandle (a ball).

▶noun

• 1 an irregular bouncing motion.

• 2 N. Amer. a mishandling of a ball.

– origin C19: frequentative of bob1.