through the mill

through the mill idiom
Hardship or rough treatment, as in They put him through the mill, making him work at every one of the machines, or Jane was exhausted; she felt she'd been through the mill. This term alludes to being ground down like grain in a mill. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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