exit clause

exit clause (plural exit clauses)

1. (law) A provision in a legal document or lease allowing a signatory or lessee to terminate the contract legally and usually without penalty under certain circumstances.
   • 2018 November 8, Heather Stewart, Daniel Boffey, “Tory Brexiters planning to reject deal even with backstop exit clause”, in The Guardian‎^[1]:

     Eurosceptic Conservative MPs will still vote down the government’s Brexit deal even if Theresa May negotiates an exit clause from the Irish backstop, the former minister Steve Baker has insisted.