The Collaborative International Dictionary
To be off one's food
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. Off side (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 behind him. To be off color,
to be of a wrong color.
-
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.