Meaning

• An excited activity; a stir.

• A cover to protect and hide the back panel of a computer or other office machine.

• A frame worn underneath a woman's skirt, typically only protruding from the rear as opposed to the earlier more circular hoops.

Meaning

• To move busily and energetically with fussiness (often followed by about).

  "The commuters bustled about inside the train station."

• To teem or abound (usually followed by with); to exhibit an energetic and active abundance (of a thing).

  "The train station was bustling with commuters."