What does the word snag mean?

Usage examples for snag

  1. And you write me such soothing full- cream letters with only an occasional snag in them. – Marge Askinforit by Barry Pain
  2. And the Moon herself was so taken up with saving him, and with rejoicing that he was back on the right path, that she clean forgot that she needed help herself, and that she was held fast by the Black Snag. – More English Fairy Tales by Various