Green’s Dictionary of Slang

to run off, to escape; found in such deliberately oblique phrases as he’s gone to bolt-in-tun or the bolt-in-tun is concerned.

1812		Vaux Vocab. of the Flash Lang. in McLachlan (1964) 228: bolt-in-tun: a term founded on the cant word bolt, and merely a fanciful variation, very common among flash persons, there being in London a famous inn so called; it is customary when a man has run away from his lodgings, broke out of a jail, or made any other sudden movement, to say, The Bolt-in-tun is concerned; or, He’s gone to the Bolt-in-tun; instead of simply saying, He has bolted, &c.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1835		Metropolitan Mag. XIV Sept. 334: Oh, oh! thinks I, bolt-in-tun must be concerned here, and off I went, and bang came a bit of blue after me.