mind like a sieve

Since a sieve has many holes, the thoughts in such a mind might be imagined to fall out.

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mind like a sieve

1. (simile) very poor memory

   Oh, that's right. You said that yesterday, didn't you? I have a mind like a sieve.

   Synonyms: memory like a sieve, brain like a sieve, head like a sieve

• leak like a sieve

• “memory mind like a sieve” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.
• “mind like a sieve” in Merriam–Webster Online Dictionary.
• “a memory like a sieve” (US) / “a memory like a sieve” (UK) in Macmillan English Dictionary.
• “memory like a sieve” in the Collins English Dictionary
• “have a memory like a sieve” in Longman Dictionary of Contemporary English, Longman.
• “have a brain like a sieve” in the Collins English Dictionary