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Meaning & use

brain is mush

phrase·Advancedinformalfigurative

Last updated

UK/ˌbreɪn ɪz ˈmʌʃ/
US/ˌbreɪn ɪz ˈmʌʃ/

Meaning

  1. phrasefixed phraseinformalfigurative

    Used to say that someone's mind feels exhausted and unable to think clearly, especially after too much work or information.

    Grammar: The subject is usually my, your, his, her, etc., followed by is or was and mush; it describes a temporary state, not a permanent condition.

    Patterns

    • my brain is mush
    • your brain is mush
    • brain is mush after something

    After studying for six hours straight, my brain is mush and I can't remember a single formula.

    By the end of the meeting, her brain was mush and she couldn't follow the discussion anymore.

    I've been answering emails all day, so my brain is mush right now.

Common combinations

my brain is mush
I need a break—my brain is mush after all those numbers.
brain turns to mush
If I don't sleep enough, my brain turns to mush by the afternoon.
after a long day
After a long day of classes, my brain is mush.

Synonyms and how they differ

brain-dead
Much stronger and often offensive or joking; it suggests a total lack of intelligence, while 'brain is mush' describes temporary mental exhaustion.
exhausted
Focuses on physical or general tiredness, not specifically on the mind being unable to think.
frazzled
Means stressed and slightly confused, often because of many demands; it does not necessarily mean your thinking has stopped working.

Opposites

clear-headedsharp

Word family

mush noun
A soft, pulpy mass; used figuratively here for a mind that feels soft and useless.
mushy adjective
Soft and pulpy; can describe overly sentimental writing or thinking.

Commonly confused: brain is mush or mush? brain is mush or brain fog?

brain is mush vs mush

As a noun, mush is a soft, wet food like cornmeal porridge; in this phrase it is figurative and means a confused, exhausted mental state.

brain is mush vs brain fog

A more medical or long-term term for difficulty concentrating; 'brain is mush' is informal and usually temporary.

Practice

After working for ten hours without a break, I felt completely ______ and couldn't solve the simple problem.

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