The Collaborative International Dictionary of English v.0.48:
Off \Off\, prep.
Not on; away from; as, to be off one's legs or off the bed;
two miles off the shore. --Addison.
Off hand. See Offhand.
(Football), out of play; -- said when a player has got in
front of the ball in a scrimmage, or when the ball
has been last touched by one of his own side
To be off color,
(a) to be of a wrong color.
(b) to be mildly obscene.
To be off one's food or To be off one's feed, (Colloq.)
to have no appetite; to be eating less than usual.