verb (v)

• give up in the face of defeat of lacking hope; admit defeat(verb.competition)

  Synonym:
  chuck up the sponge, drop by the wayside, fall by the wayside, give up, quit, throw in, throw in the towel
  Antonym:
  enter, participate
  

  source: wordnet30
• withdraw from established society, especially because of disillusion with conventional values(verb.social)

  source: wordnet30
• leave school or an educational program prematurely(verb.social)

  Example:
  Many students drop out because they are not prepared for our challenging program.
  

  source: wordnet30