off (one's) feed(redirected from off their feed)
off (one's) feed
Uninterested in eating. That gory horror movie completely put me off my feed. She's been off her feed since coming down with a cold.
off one's feed
Have no desire to eat, have lost one's appetite, as in Even though Mom's gone only for a week, her absence puts Dad off his feed. Originating in the early 1800s and first used only for animals, this colloquial term later was applied to humans as well.