Meaning of OFF in English

OFF

( a. )

Designating a time when one is not strictly attentive to business or affairs, or is absent from his post, and, hence, a time when affairs are not urgent; as, he took an off day for fishing: an off year in politics.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.