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Verb: sign off  sIn óf
  1. (broadcast medium) cease broadcasting; get off the air; as of radio stations
  2. (usually followed by 'on') give approval to
    "Bush signed off on a secret system of detention and interrogation"

Derived forms: signs off, signed off, signing off

Type of: cease, discontinue, give up, lay off, quit, stop, surcease [archaic]

Encyclopedia: Sign off