What does the word hum mean?

Usage examples for hum

  1. First he shews Captain Bluntschli out here when he knew quite well I was in the- hum! – Arms and the Man by George Bernard Shaw
  2. I wisht I was to hum! – Wych Hazel by Susan and Anna Warner
  3. There was the ordinary subdued hum of conversation. – The Rustlers of Pecos County by Zane Grey