What is the meaning of hound?

noun

• Any of several breeds of dog used for hunting typically having large drooping ears.
  • synonyms: hound dog
• Someone who is morally reprehensible.
  • usage: "you dirty dog"
  • synonyms: cad, bounder, blackguard, dog, heel

verb

• Pursue or chase relentlessly.
  • usage: "The hunters traced the deer into the woods"; "the detectives hounded the suspect until they found him"
  • synonyms: hunt, trace