Green’s Dictionary of Slang

1. (UK Und.) a picklock key.

1718		C. Hitchin Regulator 19: A Dubb, alias Tylt, alias Pick-Lock-Key.
1719		A. Smith Lives of Most Notorious Highway-men, etc. (1926).
1768		(con. 1710–25) Tyburn Chronicle II in Groom (1999) xxix: A Dub or Tilt A Pick-lock Key.

2. (US) a raise in wages/salary.

1929

(con. late 19C) W. Winchell Your Broadway & Mine 14 Feb. [synd. col.] [Eugene] Field called on the editor to look upon the terrible condition of his kiddies and then...have the heart to refuse his raise. He got the tilt.