Merriam-Webster's Collegiate® Dictionary, 11th Edition
BUSTLE
I. intransitive verb (bustled; bustling)
Etymology: probably alteration of obsolete buskle to prepare, frequentative of busk, from Old Norse būask to prepare oneself
Date: 1580
to move briskly and often ostentatiously, to be busily astir ; teem , bustling adjective bustlingly adverb
II. noun
Date: 1621
noisy, energetic, and often obtrusive activity ,
III. noun
Etymology: origin unknown
Date: 1786
a pad or framework expanding and supporting the fullness and drapery of the back of a woman's skirt or dress