What is Quit?

Legal Definition
1) To leave or vacate real property. A landlord generally must give his or her tenant notice to quit the premises.

2) To cease doing something.
Illustrative caselaw
See, e.g. Levis v. Kengla, 169 U.S. 234 (1898).
See also
Legal Definition
v. To leave; remove from; surrender possession of; as when a tenant "quits" the premises or receives a "notice to quit." See Notice to quit.
-- Black's Law Dictionary
Legal Definition
adj. Clear; discharged; free; also spoken of persons absolved or acquitted of a charge.
-- Black's Law Dictionary
Legal Definition
Exonerated. See, also, Notice to quit. See, also, Go quit.
-- Ballentine's Law Dictionary