Definitions
1.NounA wild dog native to Australia (Canis familiaris, Canis familiaris dingo, Canis dingo, or Canis lupus dingo).
2.NounA cowardly or otherwise despicable person.
3.VerbTo behave in a cowardly or treacherous manner. (The addition of quotations indicative of this usage is being sought:)
4.VerbTo renege on an agreement or situation. (The addition of quotations indicative of this usage is being sought:)
5.VerbTo let down another individual. (The addition of quotations indicative of this usage is being sought:)