What is the meaning of snag?

noun

• A sharp protuberance.
• A dead tree that is still standing, usually in an undisturbed forest.
  • usage: "a snag can provide food and a habitat for insects and birds"
• An opening made forcibly as by pulling apart.
  • usage: "there was a rip in his pants"; "she had snags in her stockings"
  • synonyms: rip, rent, split, tear
• An unforeseen obstacle.
  • synonyms: hang-up, hitch, rub

verb

• Catch on a snag.
  • usage: "I snagged my stocking"
• Get by acting quickly and smartly.
  • usage: "snag a bargain"
• Hew jaggedly. .