Definitions for off-season
Random House Webster's College Dictionary
a time of year other than the regular or busiest one for a specific activity.
(adj.)of, pertaining to, or during the off-season.
(adv.)in or during the off-season.
Origin of off-season:
the season when travel is least active and rates are lowest
That part of the year when business is most slack and there are fewest clients or visitors
Period of time when regular competitions are not being held, or when an athlete is not participating in competitions.