exit clause
noun1
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.
- 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.2018 November 8, Heather Stewart, Daniel Boffey, “Tory Brexiters planning to reject deal even with backstop exit clause”, in The Guardian: