骨碌

gū lu

to roll rapidly; to spin

Taiwan pr. [gu2lu5]

骨

gū

used in 骨碌碌[gu1 lu4 lu4]

碌

lu

(bound form used in 忙碌[mang2 lu4], 勞碌|劳碌[lao2 lu4], 庸碌[yong1 lu4] etc)