What does the word steam mean?

Usage examples for steam

  1. I used to go to the window when Electra was in the room, and make up faces, to let off steam and keep her from knowing. – Rose MacLeod by Alice Brown
  2. She had never seen a steam launch before, or anything like it. – The Little House in the Fairy Wood by Ethel Cook Eliot
  3. We had learned what day the first steam car was expected out to Dearborn. – The Bark Covered House or, Back in the Woods Again by William Nowlin