signs off

Verb

sign off (third-person singular simple present signs off, present participle signing off, simple past and past participle signed off)

1. (idiomatic) To log off; to stop using a computer, radio, etc.; especially, to stop talking.
   • He finished the conversation and signed off.

   Synonyms:

   log off, log out, sign out

   Antonyms:

   log in, log on, sign in, sign on

2. To cease broadcasting a radio or television signal, usually at the end of a broadcasting day.
   • Before he signed off the radio station for the night, the disc jockey played the National Anthem.

   Synonyms:

   closedown

3. to give one's official approval to something for which it is needed, especially by a signature.
   • Once the vice-president signs off on the project, we can start construction.
4. To use a valediction, such as the end of a letter or broadcast.
   • Boys of about fourteen to sixteen opened their letters to each other with 'manly' forms of address such as 'Amice' (My friend). They signed off with 'Vale' (Farewell), or 'TT' (Totus Tuus, All yours).2011 September 9, Willemijn Ruberg, Conventional Correspondence: Epistolary Culture of the Dutch Elite, 1770-1850, BRILL, →ISBN, page 81