be off feed
be off (one's) feed
To be uninterested in eating. Oh, I'm off my feed since watching that gory horror movie. She's been off her feed since coming down with a cold.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
be off (one's) feed
To have lost one's appetite: The dog is off its feed this week.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.