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gut it out
To persist through a difficult situation. I'm amazed you gutted it out and went to school with such a high fever.
To endure or tolerate some task or activity despite difficulties, hardships, or unpleasant conditions. A noun or pronoun can be used between "gut" and "out." I know you aren't enjoying college so far, but you should gut it out for at least the first year. Well, you gutted out your first winter in Siberia—how was it? I gutted that job out for nearly 10 years, but I came to realize that life is too short to spend it being miserable.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
gut it out
Also, tough it out. Show pluck and perseverance in the face of opposition or adversity. For example, I know it's hard but we'll just have to gut it out, or His boss has a terrible temper, but Joe is determined to tough it out. The first term dates from the mid-1900s; the variant was first recorded in 1860.
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.
gut it outSlang
To show pluck and perseverance in the face of opposition or adversity.
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.