1
general::
Away from the town or city under consideration; away from home. For example, In his new job Tom will be going out of town nearly every week, or He's out of town but I'll have him call you when he gets back. [Late 1300s]
American Heritage Idioms
2
general::
Phrase(s): out of town
temporarily not in one’s own town. • I’ll go out of town next week. I’m going to be at a conference. • I take care of Mary’s cat when she’s out of town.
McGrawhill's American Idioms And Phrasal Verbs