off the top of your head
from the knowledge you have in your memory:
"What's the capital of Mauritania?" "I don't know off the top of my head, but I could go and look it up."
Thesaurus: synonyms and related words
Memory and memories
- at/in the back of your mind idiom
- back
- clear
- corporate memory
- dim
- déjà vu
- eidetic
- flash
- flash back
- from memory idiom
- go
- live
- long memory
- nostalgia
- nostalgic
- photographic memory
- recollection
- remembrance
- rote
- within your memory idiom
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