Peremptory undertaking
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
An undertaking by a plaintiff to bring on a cause for trial at the next sittings or assizes.
Lush, Pr. 649.
As to peremptory "Challenge," "Defense," "Instruction," "Mandamus," "Nonsuit," "Plea," and "Writ," see those titles.