Meaning of “off the top of your head” in the English Dictionary

british dictionary

"off the top of your head" in British English

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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."

(Definition of “off the top of your head” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)