deadwing means: Person who is unreliable or untrustworthy. A person who is out of favor and often marginalized. A person who causes harm to others, or does great damage due to stupidity, hubris or vanity. Icarus, for example, flew too close the sun melting his wings and fell to his death. Surprisingly this word appears in mainstream dictionaries but is not used in English-speaking countries. Porcupine Tree’s “Deadwing” album is a popular reference. Martinez uses it in Walking Dead when he refers to Governor as a “deadwing”. (in Community Dictionary, added by Tianna Hayden)