What does the word acrobat mean?

Usage examples for acrobat

  1. A dictionary flew across the room, struck the amateur acrobat in the back, and fell on the floor, but not much more quickly than my new friend went over backwards, the blow having made him overbalance so that his feet came with a crash on the desk, the ink flew out of two little leaden wells, and the performer rolled off on to the form, and then to the floor, with a crash. – Burr Junior by G. Manville Fenn
  2. This went tumbling over and over, like an acrobat doing a somersault, then burst in the most startling way. – The Kangaroo Marines by R. W. Campbell