from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
NON OMITTAS, English practice. The name of a writ directed to the sheriff
Where the bailiff of a liberty or franchise, who has the return of writs,
neglects or refuses to serve a process, this writ issues commanding the
sheriff to enter into the franchise and execute the process himself, or by
bis officer, non omittas propter aliquam libertatem. For the despatch of
business a non omittas is commonly directed in the first instance. 3 Chit.
Pr. 190, 310.